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Hopkins Knockout Adapter for 4-Way Flat Trailer Connector

Hopkins Knockout Adapter for 4-Way Flat Trailer Connector

Item # HM47605
Our Price: $10.02
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Trailer Wiring
Shipping Weight: 0.16 lbs
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Keep your 4-pole flat trailer connector accessible with this adapter that lets you mount the connector in a 6-way round bracket (sold separately) or in a 1-1/4" diameter hole. Great Prices for the best trailer wiring from Hopkins. Hopkins Knockout Adapter for 4-Way Flat Trailer Connector part number HM47605 can be ordered online at or call 1-800-940-8924 for expert service.
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  • Reviews (79)
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  • Videos (1)
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Hopkins Trailer Wiring - HM47605

  • Trailer Connectors
  • Vehicle End Connector
  • 4 Flat
  • Plug Only
  • Hopkins

Keep your 4-pole flat trailer connector accessible with this adapter that lets you mount the connector in a 6-way round bracket (sold separately) or in a 1-1/4" diameter hole.


  • Adapter plugs into your vehicle's 4-flat trailer connector so that you can mount the connector in a 1-1/4" diameter hole
  • Versatile installation
    • Mounts in a 6-way round bracket (sold separately)
    • Can replace 1 of the vehicle's license plate lights
  • Dust cover keeps out dirt and water
  • Durable PVC construction

47605 Hopkins 4-Pole Flat Knock Out Adapter

Installation Details HM47605 Installation instructions

California residents: click here

Video of Hopkins Knockout Adapter for 4-Way Flat Trailer Connector

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

Video Transcript for Hopkins Wiring - Trailer Connectors - HM47605 Review

Today we'll be reviewing part number HM47605. This is the Hopkins Knockout Adapter for a four-way flat trailer connection. This adapter is going to plug in to your vehicle's four flat trailer connector so that you can mount the connector in an inch and a quarter diameter hole. It's a very versatile installation. This will mount in a six-way round bracket, which is going to be sold separately, part number HM48605. It can also replace one of the vehicle's license plate lights. On this side here we have the dust cover that's going to help keep out dirt and moisture. It simply just fits over the four flat connection, providing a nice tight, secure fit. This is made from a durable PVC construction so it's going to be very strong, very durable and again, that dust catcher's really going to come into play when it comes to keeping out dirt and moisture. That's going to do it for today's review of part number HM47605.

This is the Hopkins Knockout Adapter for a four-way flat trailer connector. .

Customer Reviews

Hopkins Knockout Adapter for 4-Way Flat Trailer Connector - HM47605

Average Customer Rating:  4.8 out of 5 stars   (79 Customer Reviews)

Keep your 4-pole flat trailer connector accessible with this adapter that lets you mount the connector in a 6-way round bracket (sold separately) or in a 1-1/4" diameter hole.


I am very pleased with the products and service provided by
The 4-way Curt trailer hitch wiring connector and Hopkins Adapter for my 2015 Honda Pilot were easy to install with the clear and well illustrated directions. They are performing as advertised with no additional troubleshooting required. The quality suggests that they are durable and will last for at least as long as I own the vehicle. I currently tow boat trailers. The car came with the OEM trailer tow bar (hitch) and basic internal trailer wiring. The parts were just what I needed to complete the package.
[I suggest you include a note to install the provided 10A blade fuse in the holder on the S3 harness in the installation instructions]

Charlie F.


I am very happy with your product and expect I will continue to be.


A great adapter for a clean practical look on plastic bumper moulding.
Quick and easy online ordering.


Great quality, will work for my application. I was worried I would have to make an odd hole, but cutting a circle with a hole saw will work perfect.


I used this device to tidy up a recent hitch and wiring install on my Volvo wagon. I ran the receptacle out the bottom of the car and just zip tied it to the hitch. It looked OK, but I wanted something cleaner that didn’t involve attaching a bracket to hold the 4-pole connector. After a few minutes of searching I found this device. All I had to do was buy a 1.25” hole saw for my drill and the rest was easy. Drilled through the plastic fascia on the underside of my bumper. I think it looks great! Attached are before/after pics. Another great experience with!!!


Quick install, just drill a hole and pop it in. 4 stars because I don’t like how it sticks out so far and is noticeable. The manufacturer may consider designing one that is recessed in farther even if you need to drill a bigger hole. Love etrailer !


I used this to make an easy trailer connection for my wife's CanAm Spyder. It works perfectly! It was easy to install and it was "Plug and Play". Thank you for providing this product.


Worried as first because the picture with instruction showed an adapter and I had a curved surface on my GMC Terrain at the mounting point. Worked great and did not een have to take the ld pigtail off.



Perfect! I did sell the Terrain and the new owner thought the trailer wiring looked like it was from the factory. Kudos, Etrailer...


Great service. On time and accurate!


Exactly what I needed to clean up the installation of my trailer wires on my 1995 Ford F150.



Excellent! It is still perfect.


Worked perfectly. Unfortunately ran into a deer two months ago and.dont have the vehicle now


Quick delivery and works as expected.


I'm writing from Canada. I ordered the Curt receiver trailer hitch, and customized wiring harness. Although it took a while to get here, the product was exactly as specified, installed quickly with good instructions. One word of advice, use at hoist to install the hitch, laying on the garage floor and tightening the bolts to specs. just about did me in, maybe I'm getting to old. The wiring harness was a breeze to put in with excellent instructions. Good product and service.


Worked great. Needed to locate flat 4 through to my hitch electrical mounting plate, fit perfect and great prive



Great product, no issues.


Installation photos


I ordered the wrong part. What I need is a dust cover for a 5 wire flat trailer plug.

Etrailer Expert

Jenny N.


I will have our customer service team reach out to you. We do have a cover available that will fit a trailer side 5 flat connector. It is part # ACP5B.


Excellent service, easy ordering process. Will definitely use entrailer in the future.


Just installed it today 8/21/21 on bumper sure makes it easier to get to I don't have to reach under bumper to hook up


great product. just what I needed to get the wires neat and out of the way.


I added this to my 2002 Ram 1500. I drilled a 1.25" hole in the plastic plate next to the license plate and mounted it there. It was easy to install and makes my wiring harness easy to access. Good quality.


Thanks! Great idea! 1979 Ford F150 4X4


I am always pleased with how etrailer treats my orders. I am angry with myself for ordering the bracket for the socket attachment ( realized that I already had one), but the order was filled the day I would have canceled--so I just let it go.


It might have fit something, but not my truck bumper. The hole for the license plate light was way bigger than the adapter.


Nice solid chunk of plastic. Didn't come with any grease, but that's ok. I'm using a small amount of a very thick silicone plumbers grease to keep the connections from corroding & adhesive lined shrink tubing on the inner connection, because that's going to be out of reach inside a plastic bumper cover


have always had good service with etrailer, I really like there product videos .


Decided for now not to install product I changed my mind and wanted to stay with the clean rear bumper cover with the Ecco hitch hidden trailer hitch.

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See what our Experts say about this Hopkins Trailer Wiring

Info for this part was:

Employee Lindsey S
Edited by:
Lindsey S
Employee Jameson C
Expert Research:
Jameson C
Employee Jeffrey L
Expert Research:
Jeffrey L
Employee Cole B
Installed by:
Cole B
Employee Tammy D
Written by:
Tammy D
Employee Alexander C
Updated by:
Alexander C

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