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4 Pole Knock-Out Adapter - Hidden Hitch Trailer Hitches

4 Pole Knock-Out Adapter - Hidden Hitch Trailer Hitches

Item # 30601
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Trailer Wiring
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Tow Ready Trailer Wiring - 30601
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Tow Ready 4-pole knock-out adapter allows 4-way flat trailer connector to be mounted into a 6-way trailer connector bracket. Lowest Prices for the best trailer wiring from Tow Ready. 4 Pole Knock-Out Adapter - Hidden Hitch Trailer Hitches part number 30601 can be ordered online at or call 1-800-496-5010 for expert service.
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  • Reviews (35)
  • Q & A (0)
  • Videos (1)
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Tow Ready Trailer Wiring - 30601

  • Trailer Connectors
  • Vehicle End Connector
  • 4 Flat
  • Plug Only
  • Tow Ready

Tow Ready 4-pole knock-out adapter allows 4-way flat trailer connector to be mounted into a 6-way trailer connector bracket.


  • Adapter allows 4-way flat trailer connector to be mounted into a 6-way trailer connector bracket
  • Dust- and water-resistant
  • Works great on Hidden Hitch brand trailer hitches with built-in electrical brackets

118601 4 Pole Knock-Out Adapter - Hidden Hitch Trailer Hitches

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Video of 4 Pole Knock-Out Adapter - Hidden Hitch Trailer Hitches

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

Video Transcript for Tow Ready Wiring - Trailer Connectors - 30601 Review

Today we'll be reviewing part number 30601. This is the Tow Ready 4-Pole Knock-Out Adapter. It's going to allow the four-way flat trailer connector to be mounted into a six-way trailer connector bracket. It is dust and water resistant. Has a nice, attached dust cap that's going to protect the connection points. Just slips over the connections, just like that.

Can easily be removed. It's a nice, snug, secure fit. This works great on Hidden Hitch brand trailer hitches with built-in electrical brackets. That's going to do it for today's review of part number 30601. This is the Tow Ready 4-Pole Knock-Out Adapter.


Customer Reviews

4 Pole Knock-Out Adapter - Hidden Hitch Trailer Hitches - 30601

Average Customer Rating:  4.8 out of 5 stars   (35 Customer Reviews)

Tow Ready 4-pole knock-out adapter allows 4-way flat trailer connector to be mounted into a 6-way trailer connector bracket.


I never liked having a trailer harness hanging out from under the tailgate of my car so
I ran the wiring in behind the bumper and plugged it into this neat little item which I had
installed right in the middle of the bumper. It makes for a neat clean appearance and
convenient availability of my wiring plug. Great solution!


This was used on a 2002 Suzuki Grand Vitara. It is an excellent quality product. It seamlessly connects to the flat 4-wire adapter that I added to the vehicle & guided down to the hitch area where I could use this 4-pole knockout adapter. I used the additional mounting bracket for 4, 5, 6 way connectors, and dielectric grease all together with electrical tape for a nice clean mount that should be rather rust & corrosion resistant. All in all though, it all fit together beautifully and looks clean. Great products!


As promised, here are a few pictures of my project. It is a 2016 Harley Tri-Glide that I added a trailer hitch and your product made for a much cleaner appearance.


I mounted this into the 118137 bracket. The "tabs" on the back of this adapter that would lock into the bracket had a little too much gap and the diameter of the adapter was a little too small for bracket. The adapter moved freely once in the bracket. I had to get a little creative with electrical tape and now it looks and works great. I also added a couple of zip ties to the rear connection to assure it won't come loose over time.


The 4 pole knock-out adapter was perfect for my application. I am very happy with the quality of the product. Shipping arrived 3 days earlier than expected, which was great. Installed in a couple minutes and looks like a factory option installation. Have ordered several items recently and all have delivered earlier than expected.
Thanks George and etrailer team.


Looks like a well made adapter, purchased with bracket 118137. Where they snap together is very loose and may pull out without some sort of retainer (tape or c clips) to hold it in place. Anyway it beats having dangling wires/plugs hanging from hitch. Should work well.


I installed the product on my FJ Cruiser. The only negative I have is that it does not fit snugly in the mounting plate. It is a press fit, but it will revolve quite easily in the mount.
On the positive side, I think it will satisfactorily do the job and it looks much better than colored wires looped around the hitch receiver.


The wiring harness for my car was a perfect match. I watched the install video one time and it was a simple task to install it.
Right price, an install video, and fast delivery, you can't beat it!
Thank you!


Product was exactly what expected. The product worked and is working perfectly. I had to modify the bracket for my SUV, but that was part of the fun.
This product solved a problem for me that I had been thinking about for about 5 years!


I am putting this on a Polaris RZR 900 so I can plug my trailer I built into it. I have a picture of the trailer and the RZR. This was just what I had been looking for to use for a four flat plug


I have been using etrailer for probably 10 years. The quality and selection are great and the shipping is reasonable (sometimes free).


Fast Delivery Great Product


Love this adapter. Now the plug is nice and secure and not just hanging there.


These people practice good business.... I'll be back!


Package was delivered in timely manner and was exactly what I expected


Great shipping time, product was as des cribed


Product fits loosely in mating product #118137


work great


The parts arrived very fast, were easy to install, and look good and work well. Inexpensive compared to other sites.


I like the neat look this gives my hitch area.


Good product , good company


Easy to install, and was shipped out fa st!


Simple, easy to install and the solution for a dangeling wire in
the back ofr thye car.


Just as ordered. Thanks


Cleans up the back of the truck. Looks neat.

Show More Reviews

See what our Experts say about this Tow Ready Trailer Wiring

  • 4 Pole Knock-Out Adapter # 30601 is Specifically for Hidden Hitches
    The 4 Pole Knock-Out Adapter, part # 30601, is specifically for Hidden Hitches that have a built-in mounting bracket for a 6- or 7-way trailer connector. It snaps into the round hole for the connector. If you do not have this mounting bracket, and are starting from scratch, I would recommend getting the corresponding mounting bracket for your current 4-way. There are several mounting bracket options for a 4-way, but my personal favorite is the Mag-Flat TM 4-Pole Mounting Magnet, item #...
    view full answer...
  • Mounting Bracket for Mounting Wiring to a Hitch
    The part you were looking at, the 4 Pole Knock-Out Adapter, part # 30601, is only an adapter. You will need mounting brackets to mount your wiring to your vehicle. You can use the No-Drill Mount Bracket system, part # 18140 and part # 18144.
    view full answer...
  • Dimensions of the Hidden Hitch Trailer Hitches 4 Pole Knock-Out Adapter
    The 4 Pole Knock-Out Adapter, item # 30601, is 1-1/2 inches overall diameter and has a mounting flange of 1-1/4 inches diameter. The locking tabs are for connecting to the knockout hole are 1-3/8 inches wide and 3/8 inch thick. These are usually used to mount in the 6-way trailer mounting bracket, item # RM-910030-5.
    view full answer...
  • Availability of a 4-Way Trailer Wiring Harness with Mounting Bracket for a 2011 Chevy Colorado
    If your 2011 Chevy Colorado has a 4-Way flat, or, you install a 4-Way flat like # 118301 that you have referenced, you may be able to use 4 Pole Knock-Out Adapter, # 30601. I went out to the warehouse to measure this part and it is 1-5/8 inches in diameter at the largest point which would be a little larger than ra quarter. You would just need to route the 4-Way harness through the back of the plug, connect it to this adapter, and then mount the adapter into the hole. You will just need...
    view full answer...
  • Can 4 Pole Knock-Out Adapter # 30601 Install on Tow Vehicle and Trailer
    The 4 Pole Knock-Out Adapter # 30601 could install on either the vehicle or trailer side of the wiring. Since it has each style of connector on either side of it you could easily use it on a trailer or a vehicle. It's designed to mount in a 6-way round bracket like the part # RM-910030-5 which can easily be mounted on either a trailer or tow vehicle.
    view full answer...
  • Trailer Bulb Out Error Messages on my 2013 Ford Escape
    There is good news! This has come up a lot over the years and it isn't a difficult fix. There is a TSB out about it and your Ford dealer has the fix. Give them a call with your VIN number and explain the issue. They should have you bring it in and flash the system to allow for it to recognize a smaller power draw like what your LED's are producing. If for some crazy reason this does not work you can add resistance or "draw" be adding Putco LED Light Bulb Load Resistors part # DI34ZR directly...
    view full answer...
  • Recommendation For Clean Installation of Mounting Bracket for 4-Way Vehicle Connector
    For your 2011 Ford Explorer the Tow Ready No-Drill Short Bracket, part # 18140, the Mounting Bracket part # RM-910030-5, and the Tow Ready 4-Way Knock-Out Adapter, part # 30601, that you have referenced would make a good, clean installation of the 4-Way connector on your vehicle. Another suggestion is the Tow Ready Bracket # 18140 with the Tow Ready Mounting Bracket, part # 18144.
    view full answer...
  • Options for Mounting Dealer Installed Trailer Connector on 2008 Subaru Outback
    The Trailer Connector Mounting Box, part # RP74641 has slits at the corners of the hole in the back of the box. These slits can be enlarged by using a utility knife, and allow your trailer connector to pass through from the rear. To mount a connector I like the 4 Pole Knock-Out Adapter, part # 30601 with brackets # RM-910030-5 and # C57202. The # C57202 bracket would attach to your hitch using the included pipe clamp, bracket # 118137 would attach to it, and the Knock-Out Adapter would...
    view full answer...
  • 4-Pole Trailer Connector Mounting Options for 2009 Ford Flex
    The Draw-Tite # 75679 would be great choice. For the trailer wiring harness, I'd recommend the # 118472 T-1 connector. I have two suggestions for how to attach the 4-pole connector to the vehicle. You'll need a long no-drill bracket, part # C57202, as well as the # 18144 mounting bracket. The 4-pole will push into the mounting bracket from behind. Your other option would be to use the same # 18136 bracket, along with the # RM-910030-5 bracket. You'd then use a # 30601 knockout adapter....
    view full answer...
    Image 1 for
  • Mounting 4-Pole Connector from T-1 Connector Part # 118269 on 2011 Hyundai Veracruz
    The 4-pole connector at the end of your trailer wiring harness can certainly be zip tied, but using an installation bracket like part # 18144 along with a no drill mount like part # 18140 is recommended for a clean looking installation. A storage box, part # RP74641 is also offered. On my wifes KIA Sedona, I used the no drill mount, part # 18140, the bracket, part # RM-910030-5 and the knock out adapter, part # 30601. Your existing 4-pole would plug into the rear of the adapter and would...
    view full answer...
  • Mounting Options for 4-Pole Connector on 2010 Mazda CX-9
    I have just returned from the warehouse and have looked at the actual hitch. The hitch does feature the mounting plate and is exactly as shown in the photo. The easiest method would be to keep the connector in the cargo area until needed. When you are towing, you can run the wire out the rear door and close the door on it. The weatherstripping around the rear door is thick enough that the wires will not be damaged, as long as you avoid the area around the latch. This method provides the...
    view full answer...

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Info for this part was:

Employee Robert G
Expert Research:
Robert G
Employee Jameson C
Expert Research:
Jameson C
Employee Laura H
Updated by:
Laura H
Employee Alexander C
Updated by:
Alexander C
Employee Cole B
Installed by:
Cole B

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