Curt 4-Way Flat Wiring Connector Cover - Trailer Side

Part Number: C58750

123 Reviews | 4 Questions

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$4.94

Retail:$6.95

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curt accessories and parts trailer wiring wire protection

curt accessories and parts connector covers 4 flat c58750

curt accessories and parts trailer wiring connector covers 4-way flat cover - side

curt accessories and parts wire protection 4 flat c58750

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Hands-On with the Curt 4-Way Flat Wiring Connector Cover

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CURT Accessories and Parts - C58750

Features:

4-way flat trailer side end cap
Made from black rubber
Helps prevent rust and corrosion

58750 Curt 4-Way Flat Wiring Connector Cover

Video of Curt 4-Way Flat Wiring Connector Cover - Trailer Side

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

Video Demo Curt Accessories and Parts C58750

Hands-On with the Curt 4-Way Flat Wiring Connector Cover

Video Transcript for Hands-On with the Curt 4-Way Flat Wiring Connector Cover

Today, we're going to be taking a look at part number C58750. This is the Curt Trailer four fold flat cover. The four way flat cap is going to allow you to protect the connection point on the trailer end. This is going to help prevent rust and corrosion. You can see here how it's going to fit over the connection points, keeping them safe and damage free. It's going to feature a black rubber construction.

It's got a little tether strap here. This is going to loop around the wire bundle, or other secure location. That way, you can always keep it close to the connection point that it's designated for. That's going to do it for our review of part number C58750. This is the Curt Trailer four fold flat cover.

Customer Satisfaction Score:

100% were satisfied with this product

0% of customers were not satisfied

4.8

123 reviews

5 Stars		(105)
4 Stars		(16)
3 Stars		(1)
2 Stars		(0)
1 Star		(1)

by: Jeb 04/17/2026 One Year Later

Never lose your connector cover.

by: Mark VA 10/28/2025

The connector cover is a perfect fit. I searched extensively for one that would cover the connector on my trailer, and etrailer was the only outlet that I found that carried one. My only issue is that the plastic is pretty stiff in cold weather, and hard to fit onto the connector when the weather is cold. Ideally, wait until the weather is warm or have a way to warm it up to put it on.

by: Peter 12/09/2025

The Customer service was great. Had an odd item that several other places could not or did not send me the correct item. Either Angie or Becky ( not sure which) spent the time necessary to get the exact part and when it arrived it was perfect. Cannot say enough about the quality of service. Very Happy

by: SPro 09/11/2025

Perfect fit for my trailer wiring harness. Adds a good level of protection when in storage.

by: Lawrence 01/21/2026

Outstanding customer service. Many other suppliers should take a pointer or two from retailer.com.

Lauren, leads with great customer service. Thank you Lauren and keep up the great work.

by: Robert 11/14/2025

Fit the application for one of my trailers perfectly. Protects the trailer connector.

by: Fred 07/03/2019

I have looked for this item for 2 years locally and finally found it here.

I wanted a cover for my trailer-side light wire connector. This one works great. A snug fit and a retaining strap make this a good value.

Fred One Year Later

7/4/2020

This plug is still doing its job. The material is still soft and pliable, not cracking, after a year in the weather. I recommend it to keep your trailer light plug clean.

by: Gary P. 09/10/2017 One Year Later

I purchased the Curt 4-Way Flat Connector Cover to install on my trailer to place the trailer pig-tail into when not in use. It works GREAT!

Gary P. One Year Later

9/10/2018

Great!! However, I have since given the trailer to my son.

by: Michael M. 08/18/2014

Just the type of things I needed. All work as described. Items shipped quickly and arrived intact. Just as an awareness, the Mag-Flat (TM) 4-Pole Mounting Magnet - 38095 does not create a waterproof enclosure. That didn't matter to me but may matter to others.

Michael M. One Year Later

8/19/2015

The products worked great. I have since sold the vehicle they were for.

by: Eric 09/22/2020 One Year Later

Bought one of these each respectively for my boat trailer, my kayak/canoe/bike trailer, and my general purpose utility hauling trailer. They have kept off ANY connector contact oxidization. I DO spray the plugs with CRC 05103 QD Electronic Cleaner before putting the trailers to bed before winter, which also helps.

Seals off moisture in the form of rain or deep snow. You can't go wrong!

by: Bernie P. 06/09/2016

Just what I was looking for to protect the trailer end plugs on our trailers. Now have them on three trailers and they work great. I keep dielectric grease on the plugs and these covers keep the dirt off the plugs and the grease off of us! Simple install and do the job they are designed to do.

by: Dano 09/13/2016

Excellent transaction! Product description and picture verified it was just what I was looking for. The communication emails for shipping were responsible-kudos. The connector cover worked perfect, and replaced a loose fitting homemade connector cover I was using. The cover seals off my trailer connector from the elements, as I store my trailer outside, and slides inside the connector to greatly improve protection of the connector compared to what I was using.

by: John 09/04/2025

Anyone buying a wiring kit - understand and know that the kits do not provide the wiring end covers. This has changed since 2023, according to several stores and wiring installers. The manufacturers no longer provide these. Order this one to protect your harness from rain, snow, ice, etc. It is a cheap expense to protect your wiring.

by: Gus P. 06/12/2017

Had been looking for a protector for the trailer connector. This one cover the pins and shields them. Have installed it along with a dab of dielectric grease for extra water proofing.
And I especially like the etrailer shipping tracker graphic.

by: Nathaniel D. 08/13/2018

I bought this product to protect the trailer connectors male and female. They fit tightly and are durable. One has already accident drug along the road while I was drivung the truck and no real damage was done to the covering.

by: Maureen 06/22/2019

Took two rounds to get the right part. Don't know why the hitch installer didn't give it to me or offer one for sale. Needed it now that I live in Rainsville... Alls well

Maureen One Year Later

6/23/2020

Just checked it after all this time. No rust!

by: Deidre E 10/07/2016

Works as advertised, will keep the connector is great working order through the winter.

Deidre E. One Year Later

10/7/2017

Excellent. Performing as designed..

by: Fred 07/23/2021 One Year Later

This product works great at protecting the harness plug on my boat trailer when not being towed. Thanks e-trailer for your answer to my problem.

by: walt 09/10/2015

I needed a simple connector cover for my trailer - etrailer had it for a great price and it worked perfectly - try to buy one separate from an entire trailer hook-up package (hint: you can't) - good job!!

by: Bill H 06/08/2015

My wiring is wrapped in a plastic conduit so the retention strap was a tight fit, so be aware of that if you have heavily wrapped your wiring. Fits perfectly and snug on the connector - and also fits into the vehicle-side connector cover when I'm towing.

by: Gary H. 08/09/2014

Exactly what I was looking for. It is simple and protects my trailer wiring connector perfectly.
Keeps the elements from corroding the connector ends.
I highly recommend this item.

by: Thomas 05/06/2018

Product was exactly as described and I am extremely happy. Shipping was fast, price was great, and the trailer plug is high quality. Excellent transaction and I highly recommend etrailer! Thanks!!!

by: Bernard 11/26/2018

Easy to use and successful when a little dielectric grease is applied beforehand.

by: Shawn K. 07/16/2015

eTrailer solved my problem! Got a different car and kept getting various dashboard errors regarding turn signals, etc. eTrailer knew just what to do. Recommended a different 7 pin adapter and a set of low voltage LED's and I'm back in business. FYI, it took both to solve the problem! Way to go eTrailer!!! Thank you.

by: Bill 04/13/2024

We've been looking for something like this for a while, and are tickled to have found them at etrailer. Our only suggestion is that the attachment loop be longer. We had to use zip ties on 2 of our 3 installations to secure it.

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Replacement 4-Way Wiring Harness for Trailer That Will Last More Than 2 years
Hi Don; for a replacement 4-way wiring harness I recommend the 20 Ft 4-Way Trailer Wiring Harness # A20WB. This is a wishbone harness so you can run wires down both sides for your marker lights. Regarding the longevity of the wiring, I don't have anything I can say will last more than 2 years for sure but such a short timeframe isn't typical. Since you seem to be having some issues with your old wiring I would use a cover # C58750 to help protect the new connector. I would also make sure...
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Replacement 7-way & 4-way Trailer Connector for ETBC7 Kit
The # 37185 is the exact 7- & 4-way plug that is included in the # ETBC7 kit. We kit the # 37185 together with the # 5506 kit and some zip ties and wire loom to make a complete kit. The # 37185 will include the cover for the 4-way connector. To replace the 7-&4-way connector you will also need to re-splice your connections to the new wiring, this also comes with the 4-way connector for your already existing wiring harness. For a 4-way dust cover for your trailer end connector, you will...
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Solution for Using Curt Auxiliary LED Indicator Lights With Bike Rack Folded Up and Down
I do have a solution, but there is no adapter that will let you run both at the same time on your 2023 Subaru Crosstrek. The simple solution is to install each set of # C53201 and plug in the one you need based on whether the rack is folded up or down. You can get a simple strap to secure the plug on whichever set of lights is not in use, and add the Curt 4-Way Flat Wiring Connector Cover # C58750 on the end to keep the connections protected.
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4-Way Flat Wiring Connector Cover Trailer Side
The Cover you are looking for is the Curt 4-Way Flat Wiring Connector Cover - Trailer Side, # C58750. For added protection of your connections you may want the Dielectric Grease for Electrical Connectors, 2 oz., # 11755, which is a water resistant formulation that sheds moisture and won't wash away. It helps protect trailer connectors from corrosion.
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Info for this part was:

Updated by:

Wilson B

Updated by:

Kristina F

Updated by:

Isabelle B

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