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Protecting your trailer from theft has never been easier with the Master Lock Trailer Coupler Lock. This universal lock is designed to fit 1-7/8", 2", and 2-5/16" ball couplers. Its robust construction accommodates a variety of trailer types, making it the perfect deterrent for potential thieves. With a bright red finish, it ensures your trailer is visibly locked.
Worried about break-ins? This lock is built with heavy-duty steel construction offering impressive durability and resistance to prying attempts. Unlike pot metal alternatives that can crack or shatter, this lock will stand its ground against unwelcome tampering. Its solid build presents a formidable barrier to anyone attempting unauthorized access.
Time is of the essence when securing your assets. The Master Lock makes locking your trailer quick and hassle-free. With a simple turn of the key, the one-piece housing slides over your coupler, promising a snug, secure fit without any complex steps or adjustments. Ideal for those who value convenience along with security.
Sometimes visibility is the best security. The eye-catching red color of the Master Lock serves as a strong visual deterrent, warning potential thieves from a distance that your trailer is securely locked. This bold feature makes it easier for you to spot that your trailer is still protected and deters opportunistic theft.
Leave your worries about rust behind. The Master's red powder-coated finish is built to withstand the elements, providing consistent protection against rust and corrosion. No need to fret about weather affecting the lock's performance—this lock can handle the outdoors just as well as your trailer does.
Whether it's a standard lip, rolled lip, straight lip, surge brake, hammer blow, or UFP couplers, this lock has you covered. The adjustable design accommodates a wide range of trailer coupler styles, ensuring all your assets, from cargo trailers to campers, remain secure.
Works like a charm! With the lock on the side it does not collect snow and ice
Great product. Solidly built, simple-easy to use. I'm using it to protect a 6x10 hydraulic dump trailer that I'll leave parked in an isolated and wooded area on my farm to haul firewood and wood chips. I don't want the trailer to disappear. I have a wood splitter that I want to protect, too, so I'll be purchasing another coupler lock.
Decent coupler lock - provides some peace of mind against theft.
Recently bought a boat and the trailer did not have any way to lock the tongue that I could see. After seeing that my stepson had a trailer with this style lock on it and seeing that it would be virtually impossible to pry it off I did some research. I have purchased from etrailer in the past and trust them to only sell the best. I ordered it and received it in a timely manner. It fits perfectly and I now feel my trailer and boat are secure. Who would doubt the Master Lock brand anyway!?!
Douglas 
12/16/2020
Still working great, no complaints here.
It's a great product. It looks good on the trailer, and you can see it from very afar. And there is no way to saw it off, break it apart, or something like that. The construction is basically rounded, and there is nowhere you can find a starting point to place a saw or breakaway device on it. I have also bought different lock from Reese, and it looks wimpy, and easy to take it apart, or saw it off as some reviews have suggested. It's also easy to put it on and take it off. Just love the product. Here I attach some pictures in the campgrounds, etc.
GREAT customer service, good product - had a small issue on my end with the order they actually called me to fix it. Refreshing to do business with!!
Gwendolyn Y.
3/12/2025
Hey Anthany! We are always here to help! You can always reach out to me directly when you need something :)
Very affordable deterrent that adds that little bit more security.
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.
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 !
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
Great locks!! I feel a lot better leaving all three of my trailers at home with these locks on my trailers! Definitely recommend!
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.
Great product
I installed this trailer lock as soon as I purchased it. All I have done is spray the lock with WD40 a couple times and the lock has protected my favorite boat with NO problems at all.
Good product. Easy to use. Hope it is tamper proof
Helpful lock
Nice tool, I like that it will adjust easily for different depths so it will fit more than one size trailer tongue. It pulls in snug and with a couple firm smacks with a 2 pound hammer is still works just fine.
Looks good. Might change tumbler to make it harder to pick.
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.
Works great, would buy again.
Great product. Master Lock brand and quality. Very secure and provides me with peace of mind that it’s a huge deterrent to would-be boat thieves.
Universal lock
I have multiple trailers with different ball hitch sizes and Master Lock fits all of them well.
Good price, exactly what I ordered, but I haven't had time to try it out yet.
More security for my trailer while looking good.
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Brooke M.
6/5/2025
Yeah I hear you, Raymond! A little peace of mind about your trailer's safety I'm sure goes a long way. Especially when it's for a trailer it sounds like you get a lot of use out of. What kind of farming do you do?