Master Lock Trailer Coupler Lock - 1-7/8", 2" and 2-5/16" Ball Couplers

Master Lock Trailer Coupler Lock - 1-7/8", 2" and 2-5/16" Ball Couplers

Item # ML389DAT

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Trailer Coupler Locks

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Master Lock Trailer Coupler Lock - 1-7/8", 2" and 2-5/16" Ball Couplers Universal Application Lock ML389DAT
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Product Images

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Master Lock Trailer Coupler Lock - 1-7/8", 2" and 2-5/16" Ball Couplers Universal Application Lock ML389DAT
ML389DAT - Keyed Unique Master Lock Trailer Coupler Locks
Master Lock Trailer Coupler Locks - ML389DAT
Master Lock Trailer Coupler Locks - ML389DAT
Master Lock Trailer Coupler Lock - 1-7/8", 2" and 2-5/16" Ball Couplers Keyed Unique ML389DAT
Master Lock Keyed Unique Trailer Coupler Locks - ML389DAT
ML389DAT - Keyed Unique Master Lock Trailer Coupler Locks
Trailer Coupler Locks ML389DAT - Universal Application Lock - Master Lock
Master Lock Surround Lock - ML389DAT
Master Lock Surround Lock - ML389DAT
ML389DAT - Universal Application Lock Master Lock Surround Lock
Master Lock Trailer Coupler Locks - ML389DAT
Master Lock Trailer Coupler Lock - 1-7/8", 2" and 2-5/16" Ball Couplers Universal Application Lock ML389DAT

In Use/Installed

Trailer Coupler Locks ML389DAT - Keyed Unique - Master Lock
Master Lock Surround Lock - ML389DAT
Trailer Coupler Locks ML389DAT - Universal Application Lock - Master Lock
Master Lock Universal Application Lock Trailer Coupler Locks - ML389DAT
Master Lock Surround Lock - ML389DAT

Customer Photos


  • Surround Lock
  • Fits 1-7/8 Inch Ball
  • Fits 2 Inch Ball
  • Fits 2-5/16 Inch Ball
  • Master Lock
  • Keyed Unique
  • Universal Application Lock
Keep your trailer safe from towaway theft with this universal coupler lock. Its tough frame fits in and around most 1-7/8", 2", and 2-5/16" ball couplers; and it has a bright red color and heavy-duty construction to deter theft. Lowest Prices for the best trailer coupler locks from Master Lock. Master Lock Trailer Coupler Lock - 1-7/8", 2" and 2-5/16" Ball Couplers part number ML389DAT can be ordered online at etrailer.com or call 800-298-8924 for expert service.


  • All Info
  • Reviews (387)
  • Q & A (41)
  • Videos (2)
  • Photos
  • Why etrailer?

Master Lock Trailer Coupler Locks - ML389DAT

Keep your trailer safe from towaway theft with this universal coupler lock. Its tough frame fits in and around most 1-7/8", 2", and 2-5/16" ball couplers; and it has a bright red color and heavy-duty construction to deter theft.


Features:

  • Heavy-duty coupler lock deters trailer theft by preventing hookup
  • Large size and heavy weight defend against attempts to break or shatter lock
  • Wafer-tumbler lock mechanism resists picking and prying
  • 1-Piece housing slides to fit tightly around your coupler
  • Powder coat resists rust and corrosion
    • Red color provides a visible theft deterrent
  • Keyway cover protects lock from moisture and debris
  • 2 Keys included


Specs:

  • Application: most 1-7/8", 2" and 2-5/16" couplers
    • Fits standard lip, rolled lip, straight lip, surge brake, hammer blow, and UFP couplers
  • Limited lifetime warranty


Note: This product cannot be keyed alike.


Instructions for Locking the Trailer Coupler

  1. Insert key and turn clockwise to unlock.
  2. Pull the ball out from the lock body as far as it will go.
  3. Insert the ball of the lock into your coupler's ball socket.
  4. Push the lock body in so that it surrounds your coupler.
  5. Turn key counterclockwise to lock.


389DAT Master Lock Universal Trailer Coupler Lock - 1-7/8", 2" and 2-5/16"






Video of Master Lock Trailer Coupler Lock - 1-7/8", 2" and 2-5/16" Ball Couplers


Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.




Video Transcript for Master Lock Trailer Coupler Locks - Surround Lock - ML389DAT Review

Today we're going to be taking a look at the Master Lock trailer coupler lock. This is a universal lock that's designed to fit most 1 and 7/8th inch, 2 inch, and 2 and 5/16th inch ball couplers. This is a heavy duty coupler lock that's going to deter trailer theft by preventing hookup. It's got a nice large size to it as well as the heavy weight. So it's going to defend against attempts to break or shatter the lock. It's going to use a wafer tumbler lock mechanism.

That's going to resist picking and prying. It's also hard to duplicate keys that would fit a wafer tumbler lock mechanism. The key hole right here is easily accessible. We're looking at a one-piece housing. This portion right here is going to be the portion that slides to fit tightly inside the coupler. I'll explain it just a little bit here.

Towards the end of the video, I'm actually going to show you how to install it on a coupler. So you want it in the open position. This is going to fit into the socket of the coupler. Then once you have it installed, you push these 2 pieces together. That's going to create the nice tight fit.

This is the one piece housing so that's going to slide to fit around the coupler and provide that nice tight secure fit that we need to make sure that it's all the way secured and to fully prevent trailer hookup. We're looking at a powder coated steel construction. It's going to do a great job at resisting rust and corrosion and lasting a long time. The red color is going to provide a visible theft deterrent, so in most cases, when a thief sees a lock installed, they don't even bother with it. So this is red in color and it's easily visible, and it lets people know right away that your trailer is hooked up and they're not going to go anywhere with it. So it's a really nice design. Over the key slot, we're going to have a key way cover.

That's going to protect the lock from moisture and debris. You're going to get 2 keys with a part number, and you're going to get one trailer coupler lock. Again this is designed to fit most 1 and 7/8th inch, 2 inch, and 2 and 5/16th inch couplers. It's going to fit standard lip, rolled lip, straight lip, surge break, hammer blow, and UFP couplers. With a maximum coupler width of 3 and one quarter of an inch. So be sure that the coupler width does not exceed that measurement. This is covered with a limited lifetime warranty. Now when installing this, it's a very simple installation. You want to make sure this is in the unlocked or open position. Place it into the socket on the coupler. I'm going to go and close the latch on mine. These 2 pieces slide together. Then I simply move it to a locked position. Then it's not going to go anywhere. It's fully secured and installed. Now you can see that it will rotate like that. But that does not give it any space to come off of the actual socket area. Removing it is also very simple. Place the key back in the key slot. Move it to the unlocked position. Pull it away, and it's going to drop right out. That's going to do it for today's look at the Master Lock trailer coupler lock.


Customer Reviews

Master Lock Trailer Coupler Lock - 1-7/8", 2" and 2-5/16" Ball Couplers - ML389DAT

Average Customer Rating:  4.8 out of 5 stars   (387 Customer Reviews)

Keep your trailer safe from towaway theft with this universal coupler lock. Its tough frame fits in and around most 1-7/8", 2", and 2-5/16" ball couplers; and it has a bright red color and heavy-duty construction to deter theft.

- ML389DAT

by:


Good product, seems very solid. I like the bright red paint to let everyone know from a distance that the boat trailer is locked. My only complaint is that the paint faded very quickly. 575906



- ML389DAT

by:


Looks nice, easy to install ... guess the acid test will be whether or not me rig gets stolen. 575863



- ML389DAT

by:


Good and sturdy! Very easy to install, takes about 5 seconds. This lock will deter the honest crook. I am happy with this purchase. 574557



- ML389DAT

by:


works well 575431



- ML389DAT

by:


All products arrived on time and were the correct products I ordered. Have not had time to use the items yet, but they will perform as I expect 573881



- ML389DAT

by:


etrailer always have what I need...excellent products and fast shipping. 573717



- ML389DAT

by:


Great products and excellent service need I say more! 573773



- ML389DAT

by:


I would've given it 5 stars, except it doesn't fit my trailer. It looks to be a very solid lock. As far as shipping I received it 4 days after ordering, and it was in stock, unlike that other online site. 572093



- ML389DAT

by:


My wife said it must work pretty good because we still have the trailer. It's true it does do what it is supposed to. I would have given it 5 stars but the paint on the lock fades pretty fast. 419359



- ML389DAT

by:


Excellent customer service. We ordered two initially and were so impressed ordered two more. Great quality lock for a reasonable price. Delivery in two days as promised. Thank you. 434759



- ML389DAT

by:


Held up well through a tough winter. Too bad the paint has faded to a soft pink. Mechanically sound device. Not sure how a slide hammer would fare against the locking mechanism. 431768


Comments

Stll holding strong. Has faded to almost white but I didnt buy it for looks. Gave the locking mechanism a shot of Tri-Flow to keep it working smooth.

Bob H - 09/12/2018

43490

- ML389DAT

by:


This product works as advertised. 562874



- ML389DAT

by:


So happy to get this product. Simple, easy, and ease of mind having it! 546088



- ML389DAT

by:


The whole buying and delivery of my trailer was an excellent experience. The pre-purchase questions both my wife and I had were answered and when I picked the trailer up, the USA Trailer employee spent about a half hour going over all the trailer O&M items. In this day in age of lack of customer service, that is really commendable of USA Trailer! Thanks! 564710



- ML389DAT

by:


Works well I like the fact that it`s easy to connect, fits 1-7/8" ball up to 2-5/16" and protects my trailer peace of mind 538504



- ML389DAT

by:


Device is better than any other lock I use, I like the design, and the peace of mind of knowing that mr crook won't bother taking my trailer. Thank you 396718


Comments

the Master Lock Trailer Coupler is has been working fine, thank you

Vincent - 08/15/2018

42397

- ML389DAT

by:


Speedy delivery. The lock fit well on my utility trailer. I needed something to secure the trailer so someone does not take it. 571286



- ML389DAT

by:


This is just the anti-theft deterrent device we have been looking for. We have an Excavation business and keep a lot of expensive tools and equipment in a 6x12 trailer. We can sleep at night knowing our trailer will still be there in the morning. This thing is very easy to put on and take off. 539334



- ML389DAT

by:


im retired from law enforcement and have seen EVERYTHING stolen so this lock is another layer of defense from the bad guy. It works very easily, is strong and with it being red, it is quite a deterrent. 247256



- ML389DAT

by:


I like the ease of use, however it doesnt fit snug. Almost looks like a couple of well placed sledge hammer hits would knock it off. Probably need something else. 554522


Comments

The sad fact is that locks are only for keeping honest people honest. If a thief is determined to steal your trailer, theyre going to get it. The idea is to provide a deterrent, to make the thief expend energy and make noise in order to defeat the lock. Most thieves are opportunistic, if the trailer isnt easy to steal, theres a good chance theyll move on to one thats easier.

-- Mike L - 08/17/2018

42499

- ML389DAT

by:


We bought several accessories for our new Winnebago at etrailer. As always the products were good quality and the delivery was very fast. etrailer is my preferred dealer for trailer parts and accessories. Great service and follow up. 473465



- ML389DAT

by:


My second lock for my other trailer. This is an excellent solid product. It seems like it would be difficult to defeat. I'm sure it can be defeated, but probably not as fast as grabbing my shotgun and racking the slide. 498937



- ML389DAT

by:


I have just gotten product seem ok 553724



- ML389DAT

by:


Got one for insurance purposes. It does go on my boat trailer coupler, but could stand to be a little tighter. Seems just a little loose, although this is my 1st one maybe this is the way their supposed to fit. 395516



- ML389DAT

by:


love it, it is very heavy duty we have 2, one is used on our boat trailer and the other for an enclosed trailer. feel very safe leaving them parked in the yard when we leave for a weekend. no fading of color, key still works great. recommend to others when ever we can 497282



- ML389DAT

by:


I feel much better about parking my trailer on the street with this lock on the hitch. Not only does it lock up the hitch securely but the bright red color signals to prospective thieves that this trailer cannot be towed. It is easy to attach and easy to remove. Also very compact so it can be stored easily. The shipping time was less than I expected. etrailer.com is my goto supplier for my trailer accessories. 467210



- ML389DAT

by:


This is a terrific design since unlike padlocks, can't easily be cut with bolt cutters. I like the bright red color which tells a thief there is a lock to deal with from a distance. I think someone who wants your trailer can probably defeat any system you use, so the goal is to make it tough as possible and I think this lock does that. 287555



- ML389DAT

by:


I received the Master Lock Trailer Coupler Lock that I ordered. It was delivered in just a few days just a it was supposed to. It is exactly what I was looking for. It will help detour anyone from stealing my trailer ! I am extremely happy with the lock and etrailer ! I think this is a great company with great pricing on there products ! I will recommend them to everybody and will be ordering with them again real soon ! It was an easy and excellent experience. Great customer service too ! Thanks etrailer ! 298258



- ML389DAT

by:


very simple. nice and bright . nothing is full proof but this seems like a good deterrent especially since it doesn't seem to have a place for thieves to use bolt cutters like some of the other options i've seen. 267975



- ML389DAT

by:


This 'Master Lock' is a great item in added protection for my modified cargo trailer. We all work hard in keeping what is ours' ours. There's always that impulse for those shady individuals out there in breaking a simple lock in taking your hard earned items. This Master Lock looks very durable and notable in given them second thoughts. Thanks' George J. For a quality item' great shipping and packaging. Will highly recommend "etrailer" to new friends I meet on the road. Regards' RG 238081



- ML389DAT

by:


This lock does a good job of denying access to the trailer hitch ball so that the trailer is less easily stolen. However, an inventive thief could still chain to the hitch and tow the trailer away unless the wheels are somehow locked against rotation. This is a good initial safety measure and works well as intended to deny access to the hitch ball. The only issue I have seen is that the cover quickly faded to pink color in the sun and is no longer bright red - only a cosmetic issue. 409492



- ML389DAT

by:


This lock was chosen by me for medium security of our 20' boat. I was installed easily and will keep most who want to try to steal something like our boat away. If they really wanted to, a sledge would destroy this. Where there's a will there's a way. For our 31' trailer, I opted for another model. That would take a lot more beating to 'maybe' get off the hitch. It also costs about 8 times as much though... 421763


Comments

After one year, taking it off. Our boat is in use again after 1 year, going to Lake Mead. It has held up great, easy to open, and kept thieves away...

Jerome M - 08/17/2018

42495

- ML389DAT

by:


Purchased to secure my new trailer in an unsecured lot. Item easy to use. Good as a short term deterrent but not fully secure. Others on the market that are indestructible, but hey, you get what you pay for. 318238



- ML389DAT

by:


Nice lock. It’s nice that there is nothing to really cut on it. Latches on nice and strong. Easy to use. You could even use a default latch lock with it. Hope it holds up as good as it looks. Will review again after awhile. 438163



- ML389DAT

by:


We received 10" of snow so I have not tried this on the trailer yet, but I have a new unused coupler that it fit perfect I will be ordering more of these for myself as these are Christmas gifts. Sierra H. was easy to work with and was very concerned that I got the correct product. Thanks to her and etrailer !! Happy Holidays to all!! 323028



- ML389DAT

by:


This lock is very easy to use. Will fit all your standard ball sizes. And looks like it would be very difficult to defeat. I just got this so I can't speak to the longevity or how it handles winter weather but so far so good. 461544



- ML389DAT

by:


We have two vintage trailers. The first one is a 1948 Spartan Manor, we haven't tried the lock on it yet, and the other is a 1958 Aloha which I put the lock on it and it fit like a glove! It was really easy to put on too, so I think it should fit the Spartan just fine also. We got one for each trailer. We like the color for two reasons, one, being red, you can see it clearly, less chance of running into the front of the trailer. Two, it lets thieves know there is a lock on the trailer, and it wont be easy to steal without making a lot of noise. We were pleasantly surprised when the lock came and found it so well made. It's not light or wimpy at all. We're very happy! Thanks for the peace of mind. 238293



- ML389DAT

by:


Have used these before and they are excellent. Easy to use, compact and provide good security. My older one is chrome and I hope this color (red) is as durable as the chrome. Was glad to find them at ETrailer, ordering was easy and quick and the product arrived within 5 days. Will recommend this product and ETRAILER to my friends. 422181



- ML389DAT

by:


Nice lock and fit my small trailer nicely. It looks like the coating should last as I have the trailer in a coastal region that the last lock (different brand) lasted about a year before the plating was rusted. One of my other boat trailers has a Master lock on it that has been on it for 9 years with no rust, unfortunately that model wouldn't fit the small trailer. 265280



- ML389DAT

by:


I have installed the lock on my snowmobile trailer which is in a unprotected lot, but could stand to be a little tighter. Seems just a little loose, although this is my 1st one installed maybe this is the way their supposed to fit. I actually bought two as the idea is great. 463520



- ML389DAT

by:


With drive off trailer theft going up in our area I had to find a way to protect my cargo trailer that was easy for me to apply and tuff for some would be thief to get past. BINGO this coupler lock is just the ticket, it slips on in a jiff and blocks the coupler from being used. The best part is it’s a Master Lock and tuff as nails. 267141



- ML389DAT

by:


I have had a trailer stolen with the ball latch locked open so when I saw this hitch lock I bought it to try. No one has been able to get by it yet. And the nice thing is it really does secure multiple size hitches without extra parts or fuss. The price was very reasonable too! 466111



- ML389DAT

by:


Fortunately no one has ever tried to pry it off or otherwise remove it, but maybe that's because it's a visible deterrent. I like the ease of application, and the locking mechanism works well. The only minor issue is the color seemed to fade in the hot Texas sunlight pretty quickly. But by all accounts, it's working as it was advertised. 409325



- ML389DAT

by:


Very heavy cast iron construction paired with it's practical design make this the exact product we were looking for to secure our travel trailer while in storage. I prefer this over a competitor's product because I feel the design makes it harder to remove by a thief. 294548



- ML389DAT

by:


This master lock trailer coupler fits my camper tongue perfectly and is easy to install, remove and store. The red coated steel body is heavy, solid and secures the tongue against thief as stated in the directions. I like the red powder coating for its visibility, as well. The key well is water and dust proof and stands up to those adverse conditions. This is a must for securing any trailer, any where, any time. The price is fair and the lowest I found anywhere. 273905



- ML389DAT

by:


I just received the coupler lock today so its to soon to write about quality other than it is heavy and seems to be built well. The shipping from etrailer is very quick, paid extra for the three day delivery and it was on time. I've attached it to my 2 5/16" coupler and it fit great. 388082



- ML389DAT

by:


im retired from law enforcement and have seen EVERYTHING stolen so this lock is another layer of defense from the bad guy. It works very easily, is strong and with it being red, it is quite a deterrent. 247257



- ML389DAT

by:


The above (new) Master Lock Universal Coupler Lock, is a upgrade to the current coupler lock that I currently have on my 4x6 Utility trailer, also, it will be a lot easier to lock/unlock the new coupler! Thanks! 421801



- ML389DAT

by:


Had bought another type of lock for my concession stand trailer but it would fall right off. Did a google search and found This awesome lock! The video is what sold me! excited when it arrived and fit like a glove! Perfect lock and perfect fit! The lock was delivered fast and was able to secure my property safely! 389277



- ML389DAT

by:


Recently bought the Masterlock coupling lock; it is well made, easy to install/uninstall, and we will be testing it this weekend, as I have to leave my trailer alone in a motel parking lot... FOR THE WEEKEND! 342155


Comments

Super product!

Jeff B - 02/15/2018

34733
54
391
Show More Reviews

Ask the Experts about this Master Lock Trailer Coupler Locks
Do you have a question about this Trailer Coupler Lock?


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  • I want to start off by saying that any trailer lock that you purchase will never be able to fully secure your trailer from a thief. If they are determined enough to bring equipment with them to remove a lock then given enough time they will be able to remove a lock. This will be the case no matter what you what you are looking to put a lock on. With that being said, the Blaylock EZ Lock Trailer Coupler Lock # BLTL-33 that you referenced is a great lock that has received many great reviews...
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  • Coupler Lock for Vintage Coupler on 1949 Airstream
  • Thank you so much for the photos and for your 2" coupler I recommend the Master Lock Trailer Coupler Lock # ML389DAT. This is a heavy-duty and easy to use coupler lock; you only need to put the ball of the lock into the coupler's ball socket, push the body of the lock in and turn the key. I have added links to a pair of video reviews for you to take a look at as well.
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  • Trailer Coupler and Wheel Locks to Deter Trailer Theft
  • master Lock trailer coupler lock # ML389DAT would be a bit more secure than lock # 377DAT in my opinion because it would be a little more difficult to pry off. When it comes to locks the best solution is redundancy. In other words more than one lock. You may want to consider also adding a wheel lock such as # RA-25 or # WI490. If a thief sees a coupler lock and a wheel lock they are likely going to move on to an easier target.
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  • Recommended Coupler Lock that is Keyed Alike
  • I do have a solution for you, however the Master Lock Trailer Coupler Lock # ML389DAT referenced in your question cannot be keyed alike. For a similar option that can be keyed alike, I recommend looking at the Fastway Universal Trailer Coupler Lock # DT25013KA. Like the Master Lock product you were looking at, this coupler lock is compatible with 1-7/8 inch, 2 inch, and 2-5/16 inch couplers. It features an anti-drill pin to discourage attempts to drill out the lock and a bolt-blocked...
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  • Best Coupler Lock Options for a 2015 Ranger Trail Boat Trailer
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  • Construction of Master Lock # ML389DAT Trailer Coupler Lock
  • The Master Lock # ML389DAT is constructed of steel, as opposed to pot metal. Pot metal is an alloy made of non-ferrous metals with low melting points like zinc, lead, copper, tin and aluminum. The lock wouldn't shatter or crack if struck by a hammer, unless extraordinary means like liquid nitrogen were used on the lock first. Although just about any lock can be defeated by a determined criminal if they are motivated enough and have enough time, the rugged construction of the # ML389DAT...
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  • Construction of Master Lock # ML389DAT Coupler Lock
  • The Master Lock # ML389DAT trailer coupler lock is constructed of powder coated steel. If you click the provided link, you can see a product demonstration video. As you can see by its rating, the folks who've purchased the lock are happy with it.
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  • Coupler Locks That can be Keyed Alike
  • We have coupler locks that can be keyed alike which are very similar to the MasterLock # ML389DAT, though unfortunately it cannot be keyed alike. The Fastway Universal Trailer Coupler Lock # DT25013KA can though, and like the MasterLock it works with 1-7/8", 2" and 2-5/16" couplers, and A-frame, straight channel, round tongue, flat plate and surge-type couplers. This coupler lock has been rated impressively high by a pretty large sample size of customers, with 311 reviewers leaving an...
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  • Replacement Parts for an A-Frame Atwood Trailer Coupler with 2-5/16 Inch Hitch Ball
  • I do have an option for you but we no longer carry the Coupler Repair Kit for Atwood 2-5/16" Yoke Style part 15774. Instead, I recommend replacing the entire coupler for which you can use the A-Frame Trailer Coupler part # CA-5400-B. Atwood was bought out by Lippert and their parts are becoming increasingly harder to find which is why I recommend a replacement coupler. This coupler fits most standard a-frame trailers and will accept a 2-5/16" hitch ball. It also has a black powder coat...
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  • Recommended Coupler Lock for UFP A-60 Surge Coupler
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  • Would the Master Lock Trailer Coupler Lock # ML389DAT Fit an Interstate Cargo Trailer
  • I looked up some pictures of the couplers that are on Interstate cargo trailers and the Master Lock Trailer Coupler Lock # ML389DAT that you referenced would fit the couplers and would work well. I attached a review video for this lock for you to check out as well.
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  • Key Replacement for ML389 DAT
  • You would need the part # MLK1. On the product page you would then need to enter the key number you need and we will ship you out the correct key.
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  • Best Universal Trailer Coupler Lock with Keyed Alike Option
  • I do have trailer coupler locks that can be keyed alike no matter how many you purchase but the Master Lock Trailer Coupler Lock part # ML389DAT cannot. For a trailer coupler lock that fits 1-7/8", 2", and 2-5/16" hitch balls and can be keyed alike, I recommend the Fastway Universal Trailer Coupler Lock part # DT25013KA. The Fastway Universal Trailer Coupler Lock is a very versatile device which can fit three different size hitch balls. The tube style locking core makes keys harder to...
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  • Recommended Trailer Coupler and Trigger Lock
  • If the Fastway Universal Coupler Lock for 1-7/8", 2" and 2-5/16" Couplers - Key 312, # FA86-0015-312, coupler is not snug, it may not be installed correctly. I've attached a video review for you to check out and make sure. If it is installed correctly and still doesn't meet your needs, then I recommend a different style of coupler lock like the Master Lock Trailer Coupler Lock - 1-7/8", 2" and 2-5/16" Ball Couplers, # ML389DAT. You may also be interested in a trigger lock like the Master...
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  • Locks for A-Frame Trailer Coupler
  • We have all sort of trailer locks including coupler locks for a-frame trailer couplers. Please refer to the linked page that displays all standard coupler locks. You can use a universal-fit surround-type lock such as # ML389DAT which fits all ball sizes and that prevents someone from hitching to your trailer by clocking access to the coupler, or a simple latch type lock like # RC6 that prevents the coupler latch (like the one on # CA-5400-B) from being lifted to unlock the coupler.
    view full answer...

  • Multiple Locks for a 2-5/16 Inch Coupler that Can Be Keyed Alike
  • Unfortunatley, the Master Lock Trailer Coupler Lock # ML389DAT cannot be keyed alike. But I do have an option that may work for you. The Fastway Universal Coupler Lock # FA86-0015-303 uses the specifc 303 key code and can be ordered in multiple quantities. There a number of options of different key codes available for you to choose from and any will fit a 2-5/16 inch coupler.
    view full answer...

  • Comparing Demco and Titan Disc Brake Actuators with Electric Lockouts
  • That is a tough question to answer as both are excellent manufacturers with their respective pros/cons. In regards to brake actuators, they both make and manufacture them here in the U.S.A. and they both come with a one year warranty. In regards to differences, Demco makes a wide range of different trailer and towing products whereas Titan specializes more in trailer brakes. WIth that being said we have had more positive feedback from Titan products in regards to trailer brakes, actuator...
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  • Material of the Master Lock Coupler Lock part # ML389DAT
  • The Master Lock Coupler Lock part # ML389DAT that you referenced is made of steel. It is basically the red powder coated version of the older Master Lock 379ATPY.
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  • Trailer Coupler Lock for 1-7/8, 2, and 2-5/16 Inch Couplers that Can be Keyed Alike
  • Unfortunately, the two locks you asked about cannot be ordered keyed alike or rekeyed but I do have some options for you. We have some trailer coupler locks that can be ordered in multiple quantities and keyed alike and will fit a 1-7/8, 2, and 2-5/16 inch couplers. The Blaylock EZ Lock Trailer Coupler Lock # BLTL-33-40D is one. It uses a heavy-duty bracket that fits around the coupler. Another option is the Fastway Universal Coupler Lock # FA86-0015-312 which is ordered with the...
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  • Trailer Coupler Lock For Bulldog Coupler
  • When using a bolt-on coupler such as the Bulldog # BD44150WH301, locks such as the Master Lock # ML389DAT help to prevent trailer theft. This product has a 1-Piece housing that slides to fit tightly around your coupler and 2 keys are included.
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  • Coupler Lock Recommendations for etrailer Adjustable Channel Mount Coupler # CTA-280
  • You have some options to use a lock on coupler # CTA-280. First, you could use a latch lock, # RC1. Its diameter is slightly less (9/32 inches) than the pin hole diameter for the latch (5/16 inches). Another option is # ML389DAT which works with many styles of couplers and would be a great option for your coupler. I have linked videos of both locks for you.
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Info for this part was:

Expert Research:
Michael L
Edited by:
Lindsey S
Expert Research:
Michael H
Expert Research:
Jameson C
Video Edited:
Jacob T
Expert Research:
Adam R
Installed by:
Cole B
Photos by:
Amber A
Updated by:
Danna S
Photos by:
Zach O
Updated by:
Sarah W
Written by:
Alexander C

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