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4-Pole Trailer Connector Cover

4-Pole Trailer Connector Cover

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Tow Ready Accessories and Parts - 20112
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  • Reviews (171)
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Tow Ready Accessories and Parts

  • Trailer Wiring
  • Wire Protection
  • Connector Covers
  • 4 Flat
  • Tow Ready

  • Helps prevent problems caused by corrosion
  • Universal design
  • Fits either vehicle or trailer 4-Flat connector
  • Black
  • Installs in seconds
  • Soft flexible rubber construction
  • Elastic non-corrosive cover
  • Durable long lasting rubber
  • 1-Year limited warranty

85218 4-Pole Trailer Connector Cover

Replaces Tow Ready 18147 and 20112

Item # 20112

Installation Details 20112 Installation instructions

Video of 4-Pole Trailer Connector Cover

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

Video Transcript for Tow Ready Trailer Plug Covers - 4 Flat Cover - 20112 Review

Today we're going to review part number 20112. This is the Tow Ready 4-way Flat Connector Dust Cover. Now this dust cover will protect your 4-way vehicle end connector when it's not in use. This part right here will cover the terminals on your 4-way to protect from damage or the elements. It helps eliminate any corrosion problems with your electrical system. It's very easy to install.

I just want to give you an example. I pulled a sample. This is a vehicle end connector, 4-way vehicle end connector. As you can see it's a vehicle end because you can see three of the terminals will have the rubber coating on it and the ground terminal will be exposed. What you want to do is when you install this, on this very end you'll notice there's a hole and that is designed to go over the ground so you want to make sure when you put it on, just take this, drape it over the 4-way and then make sure this, if you see on the inside of the cap that very end where the hole is, it will go over the ground. Just flip it over, push it into place and you can see that it fully protects the terminals from any damage.

If it's dragging, you don't want terminals to get damaged. This will protect it from that and also from the elements getting to it. That should do it for the review on part number 20112, the Tow Ready 4-way Flat Connector Dust Cover. .

Customer Reviews

4-Pole Trailer Connector Cover - 20112

Average Customer Rating:  4.6 out of 5 stars   (171 Customer Reviews)


Trailer connector cover still fits fine after 1 year of use.

I have had no problems with the trailer wiring connector cover.
Wayne D - 04/06/2022


For the pricing on this product, it was a great solution to create a permanent mounting solution to secure the trailer wiring connector on my truck. I wasn't able to mount it to my bumper due to the way it was designed, but I was able to get it mounted to the trailer hitch frame itself on the truck. The bracket fits the connector plug like a glove, and combined with the connector cover, it looks very nice, almost like a factory job.

My only complaint (and thus my justification for 4 stars instead of 5) with this is the Phillips head screws. I do not know why manufacturers continue to provide these with products that need securing, especially where driving them into a metal surface is highly probable. Please, please, please - update this package to include hex head screws where they can be driven with a nut driver socket on a drill. Phillips screws are very prone to stripping and a pain in the posterior to work with.

I have mine secured now with the supplied screws, but I will be replacing them with hex head screws ASAP.

They have worked out well. I liked being able to mount the trailer connector to the bottom of the bumper and the connector cover was a nice + to protect the pins.
James - 11/27/2018


I have both a boat trailer and a utility trailer. I was tired of either using a wire brush or a Dremel tool to clean the oxidation from the contacts that accumulated due to them being exposed to the weather. I bought two of these covers and each one fit perfectly. I just received them today and installed them as I was walking back from the mailbox. Only time will tell whether they are durable but they otherwise seem to be exactly what I wanted.

Adding a bit of dielectric grease to the connectors will help out quite a bit. Just keep a little glob in that cover and it will keep moisture from getting to the the metal contacts.
-- Etrailer Expert Patrick B - 08/20/2013
The covers are holding up well and have reduced maintenance time on my trailer lights. A similar type of cover would be useful for the mostly female connector on my tow vehicle. I still have to use a round file to periodically clean those contacts.
Bob P - 02/17/2015


Great little product just a little stiff. Protect the connections from the elements.


The cover did not fit.

I will have our customer service reach out. I am not sure as to why it would not fit for you. I do have an alternate 4 way holder to suggest for you. It is part # BA69VR
Bauer Products 4-Way Trailer Plug Holder
and mounts to the trailer
-- Etrailer Expert Jenny N - 04/05/2022


Rubber broke on the third use


The Curt Trailer Hitch Receiver arrived, took about a week with free shipping. It was well packaged and the other items (Cotter Pin, 1/8" x 1-3/4" - 165649, Mounting Bracket 4-Pole Flat – 18144, 4-Pole Trailer Connector Cover – 20112, and Trailer Idler Hub Assembly for 3,500-lb E-Z Lube Axles - 5 on 5 - Pre-Greased - 84550UC1-EZ) in my order, which arrived without any issues. I am an avid shopper online, always looking for the best deal not only on price but also total cost with shipping. This is not my first order, and most likely will not be my last. The hitch receiver was well made and has a good paint job. It fit my 2003 Toyota Tacoma snugly, however, I was able to mount it by myself in approximately a little more than an hour. The stock bumper had a towing capacity of 3,500 lbs., however it always had me worried since it is a 17-year old bumper with a few dents from previous owners. Now I do not have to worry about it and have a great place to connect the safety chains without having to get under my truck every time I connect to a trailer to secure it correctly. Read, who needs to read with a great installation video on; although the instructions were easy to read and refer to if I had any questions. After installation, the hitch receiver looked cleaner, sharper than the rest of my truck, which forced me to wash my truck!


I use these on all of my trailers and vehicle wiring. It keeps dirt, water and snow from getting into the connections. I just got a new trailer and ordered several more of them. I highly recommend them to everyone!

Im still loving them after using them for several years. I have one on each of my three trailers and another on my car. Great product!
Toothdoc - 02/02/2015


I bought this wiring harness connector cover because in the picture it looked like the rubber material is thicker and could be more durable. It is thicker and less pliable upon receipt. Time will test if it’s more durabie vs the cheaper etrailer connector cover because I have the etrailer connector cover installed on my jet ski trailer also. This unit is connected to my van hitch wiring connector. This connector cover is over 3 times the price of the etrailer 4-way connector cover but I’m hoping it’s at least 3 times more durable than the etrailer cheaper but work just as well putting a cover and corrosion protection from the weather. But I’m giving this item a 5 star rating for what appeared to me as a thicker, less flimsy than the etrailer connector cover and hence, durable.


This would have been perfect for the 4-Pole at the truck end of the connection ( the female end). I, however, had purchased it with the idea in mind of using it as a cover for the male end ( the wire connections at the trailer coupler end). I had to cut-out a bit of the inside to get it to fit the male end but, it seems to fit snuggly enough. Especially since I will really only use it when the trailer is parked in the yard, then will remove it to hook-up to my truck when I'm trailing.


I bought this item to protect the end of the wiring harness on the trailer, since it sits outside 24/7. The end of the wiring harness on the trailer is rectangular with squared off corners and this connector cover is rectangular with rounded off corners. In order for this cover to fit, one must force it over the squared off corner connector. That eventually will make the end of the connector out of shape and will not fit properly into the connector that it mates with from the vehicle. Actually this connector cover is made to be used on the connector that comes from the vehicle which has rounded off instead of squared off corners.
As far as I can see, etrailer does not sell a connector cover for the trailer connector. Maybe their website should specify that this cover only works for the vehicle end.


You don’t need this part for the project. Wiring harness comes with it.


The product does what is should. The only minor issue I had was the molded material encroached into the ground-pin hole which prevented the cover from staying on once installed. A small bit of "carving" out the hole with a pocket knife opened it enough to stay on. All in all, it does what it should and isn't an eye-sore.


Is exactly what I was looking for. It has worked perfectly and the price for the product was fair, as well as the shipping.

Thank You
Roy S.

still working fine
Roy S - 01/25/2015


Good idea to use this on the vehicles harness when it is not connected to the trailer harness, since there is power at the plug end when the lights are operating on the vehicle.


Thank you for your great customer service. When I ordered two of the trailer connector covers, you called me to confirm that I really meant to order two. I don't think no other company goes out of their way to please their customer as you do. Thanks again for you outstanding customer support.


This cover does a great job of keep the electrical connections clean and corrosion free. I recommend this item.


I received the cover for the 4 flat wring that will be used when I receive the Reese Titan Hitch Box Extension. Thank you


Was happy to find this dust cover for trailer wiring. Wasnt aware these were available as a replacement or add on. Pricing was fair, and ordering was a snap. Notifications and delivery was very prompt. Thanks etrailer,for your service.


Just a small waterproofing part but it is exactly what I was looking for.

Delivery was quick and I had the part in no time. I've ordered from etrailer a few times in the past year and have been very satisfied with everything I've ordered.


Weatherproofs your 4-way plugs (it will cover both "male" and "female" ends) in case your wires are exposed to the elements. I have replaced three plugs on one trailer due to corrosion. Much cheaper than building a barn for your trailer!


really easy to install! the video e trailer has for this was a huge help. great product, looks like it will hold up well.

Thanks for checking in. The trailer hitch was great and held up fantastic. Only got to use it about 4 times, but it worked perfectly. The wiring harness matched perfectly and was a breeze to install. The SUV I mounted it on didnt have enough towing capacity for my new boat, so I ended up trading it in for a newer one that had a factory hitch pre-wired setup. So the hitch receiver and wiring stayed with the SUV upon trade in. I held on to the ball mounts and the other bars and have used them a bunch for towing and launching and they are working great.
OC - 09/28/2018


Inexpensive protection to prevent corrosion on the 4-Pole trailer pin contacts. With this cover your connector will always be clean and ready to make a corrosion free connection.


Fits 4 prong connector well. Good thick quality rubber that will last. Important to keep moisture and road grim out of connector.


Very nicely made and seems like it will last, but it Does not fit on both vehicle and trailer, will only fit the normal smaller connector that all other covers I have tried will fit.
I gave it a one, because I purchased it to fit the larger of the two connectors.

Show More Reviews

See what our Experts say about this Tow Ready Accessories and Parts

  • Can 4-Way Trailer Connector Covers Be Installed after the Wiring is Installed
    The 4-Pole Connector Cover, part # 20112, can be slipped over an existing 4-Pole connector. It does not have to be installed when the wiring is first installed.
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  • Will Trailer Connector Cover 20112 Fit 4-Way From Truck
    Yes, the 4-way cover part # 20112 that you referenced is going to fit the 4-way you have that you sent in a picture of.
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  • Availability of 5-Way Tralier Connector Cover
    We currently carry one 5-way cover, part # 20115. It also has an integrated LED Circuit tester that you can use to make sure the wiring on your vehicle is working properly.
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  • Will 5-12 Tractor Tire Fit On Dextstar Solid Center Wheel 12" x 4" AM20112?
    They sure will! 5-12 Tractor tires are designed to fit 12" diameter wheels that are 4" wide, which is exactly what the Dexter Solid Center Steel Wheel # AM20112 you were looking at are. Now to confirm that this wheel will fit the vehicle/machine you are planning on installing it on you will need to measure the bolt pattern of your current wheel following the included help article. The # AM20112 has the common 5 on 4-1/2" bolt pattern, but if you find you need a different bolt pattern...
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  • Can a 6x12 Tractor Tire Be Mounted On the Dexstar Solid Center Steel Wheel
    Yes, you can mount a 6x12 Tractor Tire on the Dexstar Solid Center Steel Wheel part # AM20112 no problem. The recommended wheel width for a tire that size is usually 4" so you will be good to good. The Dexstar Solid Center Steel Wheel can also be used with or without an inner tube.
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  • Replacement Plug Cover for 4 Way Connector on Hopkins HM39531
    To replace the cover on the 4 way plug on your # HM39531 you can use the 4-Pole Trailer Connector Cover # 20112.
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  • Will T-One 4 Pole Trailer Connector # 118341 Fit a 1999 Toyota 4Runner without Factory Tow Package
    The T-One Vehicle Wiring Harness with 4 Pole Trailer Connector, # 118341, is designed to fit all models of the 1999 Toyota 4Runner. It does come with installation instructions which I have linked to for you to review. The connection points are located behind the interior trim panels behind each taillight. The 4-pole trailer connector will be stowed in the rear cargo area when not in use. You may be able to route the 4-Way through the bottom of the cargo area and out under the vehicle through...
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  • How to Protect Trailer Wiring on a 2011 Subaru Forester from Winter Weather
    If the dealer does not have the exact part, you may be able to take the grommet with you to a hardware store where you may find something that will work in its place. I could not find an aftermarket grommet. It may be that the vehicle is still fairly new and that part is not yet available. Another option is to provide some protection for the wiring. For the actual wires, you can use a wire loom, # 39035. I would would go ahead and wrap the wiring in electrical tape for added protection. ...
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    There are covers for a 4-Way connector to help keep the pins in good shape! I recommend using the Tow Ready # 20112 to help protect the pins on your 4-Way. If the pins are bad enough on the Ford Ranger then you can even cut it off and splice on a new connector like the Hopkins Endurance Easy-Pull Harness # HM48044 (which comes with a cover) with butt connectors # DW05744-5. Adding some dielectric grease like part # 11755 to the connectors occasionally will also help to keep the pins...
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  • Towing Equipment for a 1982 Jeep CJ-7 Renegade
    If you are looking for a trailer hitch receiver and wiring for your 1982 Jeep CJ-7 Renegade then you have come to the right place. The Curt Class III Trailer Hitch Receiver # 13412 is a great option for a trailer hitch receiver that we have. It has a 4,000 lbs Max Gross Trailer Weight (GTW) and a 400 lbs Max Tongue Weight (TW). This hitch will require some drilling to install. When it comes to wiring for your Jeep you will have to do some splicing to get the appropriate connections....
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    If your trailer's frame is between 18 inches and 51 inches on center, then I recommend the Curt RV hitch # C13702. This hitch is the strongest capacity we carry for tongue weights up to 500 lbs and a towing capacity of up to 5,000 lbs without weight distribution. It can bump up to 600 lbs tongue weight and 6,000 lbs max towing when using weight distribution. If your trailer frame is between 22 inches and 72 inches wide on center, then I recommend the Curt RV hitch # 13703. This has...
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Info for this part was:

Employee Patrick B
Expert Research:
Patrick B
Employee Jameson C
Expert Research:
Jameson C
Employee Laura H
Updated by:
Laura H
Employee Wilson B
Updated by:
Wilson B
Employee Isabelle B
Updated by:
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Employee Jonathan Y
Video by:
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