1. Accessories and Parts
  2. Optronics
  3. Wiring
  4. Wire Protection
  5. Connector Covers
  6. 4 Flat
  7. 5 Flat
Optronics 4-Way/5-Way Flat Trailer Harness Plug Protector

Optronics 4-Way/5-Way Flat Trailer Harness Plug Protector

Item # ACP5B
lowest price pledge
Our Price: $6.24
Accessories and Parts
Orders above $99 qualify for Free Shipping
Shipping Weight: 0.02 lbs
In Stock
ACP5B - Connector Covers Optronics Accessories and Parts
zoom in icon
slider vertical icon
zoom out icon
Comment field cannot be left empty.
Name field cannot be left empty.

Thank you! Your comment has been submitted successfully. You should be able to view your question/comment here within a few days.

Error submitting comment. Please try again momentarily.

Product Images

In Use/Installed

Customer Photos


Need help with installation?
Locate installers near me
Safeguard your trailer wire connectors against moisture, dust, and corrosion with this plug protector. Secures to trailer to protect harness from impact and abrasion. Fits 4-way and 5-way flat connections. Hardware not included. Call 800-298-1624 to order Optronics accessories and parts part number ACP5B or order online at etrailer.com. Free expert support on all Optronics products. Guaranteed Lowest Price and Fastest Shipping for Optronics 4-Way/5-Way Flat Trailer Harness Plug Protector. Accessories and Parts reviews from real customers.
  • All Info
  • Reviews (51)
  • Q & A (1)
  • Videos (1)
  • Photos
  • Why etrailer?

Optronics Accessories and Parts - ACP5B

  • Wiring
  • Wire Protection
  • Connector Covers
  • Optronics
  • 4 Flat
  • 5 Flat

Safeguard your trailer wire connectors against moisture, dust, and corrosion with this plug protector. Secures to trailer to protect harness from impact and abrasion. Fits 4-way and 5-way flat connections. Hardware not included.


  • 4-Way/5-Way flat plug protector safeguards your trailer wire connectors against moisture, dust, and corrosion
  • Secures to trailer to protect harness from impact and abrasion
  • Surface mount with single screw - hardware not included


  • Dimensions: 1-1/2" wide x 1-1/4" tall x 1/2" thick
  • 3-Year warranty

ACP5B Connect-to-Protect 4-Flat/5-Flat Trailer Wire Connector Dust Cover

California residents: click here

Video of Optronics 4-Way/5-Way Flat Trailer Harness Plug Protector

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

Video Transcript for Optronics Trailer Plug Covers - 4 Flat Cover - ACP5B Review

Today, we are going to take a look at the Optronics 4 way and 5 way Flat Trailer Harness Plug Protector. Now this is going to be a quick and easy way to protect the four or five pole wiring on your trailer. A lot of times those can get banged around especially if you are using them for a long time or they're in frequent use.This is just going to go over our bare terminals on that trailer end wiring and then it's also going to have a small plastic post that is going to fit into the open port for our ground on our wiring. So here we have a four pole. This also, again, works with five pole, it just has the extra terminal on the one side which our plug is built for and it just matches right up. Fits inside there, fits really snug and then you would just have this attached to say the coupler on your trailer or maybe the tongue, just anywhere where you would want this wiring to be secured and out of the way.This is going to keep any debris from building up inside those terminals on your wiring or any water build up or anything like that.

And it's going to keep that wiring from getting corroded or kind of gunked up and it's also going to keep it from getting banged around on the ground or impacted with anything. It's just going to keep it nice and up and out of the way.Now this does not come with any hardware to get that attached so you will have to pick up a self tapping screw or whatever hardware you'd like to use, maybe a nut and a bolt but you will have to provide that on you own. The mounting hole is going to be about 3/16th of an inch in diameter, overall the connector is going to be about an inch and a half wide by about an inch and a quarter tall and at the widest point where it sort of bows out for our mounting location, that's going to be about half an inch. So it's really going to be about the same size as the connector on your wiring. It's pretty comparable there.All in all, it's just going to be quick and easy way to improve the longevity of your wiring on your trailer and keep everything working as it should.

It's not a bad idea to maybe put a little bit of dialectic grease in those terminals so that it'll keep the grease on your plug as well. If you don't have any of that, we do sell dialectic grease here at Etrailer.com if you want to pick some up.And that's going to do it for our look at the Optronics 4 and 5 way Flat Trailer Harness Plug Protector.

Customer Reviews

Optronics 4-Way/5-Way Flat Trailer Harness Plug Protector - ACP5B

Average Customer Rating:  4.9 out of 5 stars   (51 Customer Reviews)

Safeguard your trailer wire connectors against moisture, dust, and corrosion with this plug protector. Secures to trailer to protect harness from impact and abrasion. Fits 4-way and 5-way flat connections. Hardware not included.


Attached this to my trailer and keeps plug protected and up off the ground.


As always, excellent service and products! Never had a bad ordering experience with etrailer and I highly recommend them for both friendly and prompt service and quality of products sold. They are my go to company for trailer needs!


should come standard on all trailers excellent product.


Its a fine product, I wish they had separate 4 plug and five plug protectors because My plug has a built on partial cover rather than 4 bare prongs like in the vide so I have to modify my plug a bit to work with this which if it were specific to 4 way I would not have that problem. Price is a bit steep as this comes with no mounting hardware. Its understandable that it has no hardware because everyone has a different situation and preference. I use 12-24 stainless nut and bolt to attach to my trailer in a spot that is out of the sun etc.


best item to keep that connector clean should have had it long time ago


keep the connector plugs clean. i also used a small amount of WD-40 to help keep the rust down over the winter


Product was great, only thing was the hubcaps that came with were too big but they provided the right size free of charge


Working great to keep the connector off the ground and clean.


Works great. Protects the pins from getting road grime on them.


works great.


When you mount this item it needs a spacer or it will not work. Like this item

Thank you for your review. The standard hardware needed is a single screw but depending on where you install this, additional hardware may be needed.
-- Etrailer Expert Sierra K - 06/02/2021


Great product, keeps pins clean and corrosion free.


Keep things neat and organized. Exactly what I was looking for.


Great service and all items fit just as it should. I will be a customer for life! Thank you


Raised area around mount hole provides clearance for plug from mounting surface. It doesn't retain the plug very tightly, and only by the pins. It is for use while trailer is parked. The plug won't just fall out, but brushing the hanging pigtail can pull it. Be sure to seat the plug completely.


Works great keeps plug clean and in pla ce


Works great and as expected.


Looks great


This part was what I needed and could not find except from etrailer.


I ordered several trailer accessories. all of them were true to the website pic and description. all items fit perfectly and serve their intended purpose. Just perfect!!!


I had lost my old cover. This product fit perfect and it arrived quickly. It keeps dirt out of the contacts. The hole allows you to put a cable to hold it to vehicle so when you take it off you don’t loose it.


Fits my 5 plug (trailer end) perfect. Hard to find !


Still a great product after 1 year in u se!


still keeping my trailer wires clean


Exactly as described, shipped fast and well packed. These were hard to find in my area, but etrailer had all the ones I needed and at a good price. Thanks!

Show More Reviews

Ask the Experts about this Optronics Accessories and Parts

  • Trailer Side 5-pole Wiring Harness Weather Cover
    It too me awhile to find one. I found Optronics # ACP5B Weather Cover. Not only does it keep your plug out of the weather - but keeps it off the ground as well. I also recommend that you use the Edelmann # 11755 dielectric grease. Just dab a little bit on all the connection points. This will go a long way towards keeping those connectors free of weather, dirt, and corrosion. Once you get corrosion in one of the female connectors it is nearly impossible to get it cleaned out.
    view full answer...

  • Why etrailer.com?

    At etrailer.com we guarantee:
  • Highest quality accessories and parts for the best price.

    Our Lowest Price Pledge ensures you will never overpay for the parts you need.
  • Real product know-how.

    We make sure that the products we sell are what we say they are, and that they work the way they are supposed to work. Get real advice from a real person who has the knowledge and expertise needed to solve your problem.
  • Most detailed, accurate accessories and part information available.

    Because we take providing accurate product information seriously, we take our own detailed product photos, demo videos and installation videos, as well as verify measurements, instructions, and vehicle fit information.
  • Installations, made easy.

    We love helping people and have the most highly-trained customer service, hands-on experience, step by step videos and installation instructions.
  • Fast shipping.

    Your order is automatically routed to get out of our warehouse and to your door as quickly as possible. Receive free shipping on orders over $99.
  • Personalized service for life.

    We provide one-on-one, personalized service from the ordering process through the life of your product.
  • Trusted since 1946.

    We've been serving customers since our parts store first opened in 1946 and continue to be recognized by our customers, our vendors and third parties for exceptional service.
  • Returns Policy

    Need to return an item? No problem. Please read our Returns Policy for more information.

Info for this part was:

Employee Kathleen M
Installed by:
Kathleen M
Employee Ronnie R
Updated by:
Ronnie R
Employee Daron K
Edited by:
Daron K
Employee Brian T
Written by:
Brian T

At etrailer.com we provide the best information available about the products we sell. We take the quality of our information seriously so that you can get the right part the first time. Let us know if anything is missing or if you have any questions.