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Curt 4-Way Flat Wiring Connector Cover - Trailer Side

Curt 4-Way Flat Wiring Connector Cover - Trailer Side

Item # C58750
Our Price: $4.18
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Shipping Weight: 0.03 lbs
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  • All Info
  • Reviews (90)
  • Q & A (0)
  • Videos (1)
  • Photos
  • Why etrailer?

CURT Accessories and Parts - C58750

  • Trailer Wiring
  • Wire Protection
  • Connector Covers
  • 4 Flat
  • CURT


  • 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 Transcript for Curt Trailer Plug Covers - 4 Flat Cover - C58750 Review

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:

Customer Reviews

Curt 4-Way Flat Wiring Connector Cover - Trailer Side - C58750

Average Customer Rating:  4.8 out of 5 stars   (90 Customer Reviews)


Just what I needed. Thanks, etrailer.


As always great service. They were out of one part I needed and they will ship it later when in comes in without charging me.. I ordered it by phone and the lady was very helpful. Thanks etrailer.


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.


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.

The products worked great. I have since sold the vehicle they were for.
Michael M - 08/19/2015


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!

Great!! However, I have since given the trailer to my son.
Gary P - 09/10/2018


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.

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.
Fred - 07/04/2020


The "buckle" on the retaining strap was extremely snug, making the installation quite difficult.
Overall the connector cover was what was described.


Nice cheap little accessory. Keeps the plug clean, works as expected.

Use it every day and no signs of it wearing out
O. J - 07/22/2021


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!


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.


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.


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.


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.


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.


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.


This product was tricky to find, but fit my exposed harness tightly ensuring the terminals will be well protected in the winter months.


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.


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

Just checked it after all this time. No rust!
Maureen - 06/23/2020


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


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!!


All of your products were of very good quality and fit perfectly the first time. Thank you for being genuine. I especially appreciate you selling Dutton Lainson products, as I grew up in Hastings, NE. They are a very good manufacturer.

by: is always my first stop when shopping for equipment. Chances are they have exactly what I want, along with a video of how to install/use it.


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!!!


I don’t do reviews but etrailer is a good on line company to deal with order came fast in good condition and they keep you updated on your order thanks!


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

Excellent. Performing as designed..
Deidre E - 10/07/2017

Show More Reviews

See what our Experts say about this CURT Accessories and Parts

  • 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.
    view full answer...
  • 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...
    view full answer...

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Info for this part was:

Employee Wilson B
Updated by:
Wilson B
Employee Kristina F
Updated by:
Kristina F
Employee Isabelle B
Updated by:
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