Curt 4-Way Square Plug Wiring Extension

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  • Square Plug Wiring Extension
  • Slit loom sleeve
  • Easy to install
  • Limited lifetime warranty
  • Made in the USA

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In keeping with that, we offer a “perfect fit guarantee” that ensures your satisfaction on 3 levels: low price, free shipping, and perfect fitment.

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At PartCatalog, we’ll beat any competing vendor’s price. And we’re so confident in our rock-bottom prices that we’ll refund the difference if you find a lower price elsewhere.

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Our “free shipping both ways” policy means that returns and orders ship free of charge. When you place an order, you pay only the list price and any applicable taxes. We cover the shipping to save you money and ensure timely delivery.

100% Guaranteed to Fit

In the highly unlikely event of a fitment problem, we’ll return your purchase at no cost to you. We pay return shipping on all orders, so it won’t cost you a penny to send back a defective part.


  • Square Plug Wiring Extension that provides full trailer brake control
  • Slit loom sleeve contains wiring and protects it from damage
  • Easy and quick plug-install
  • Curt guarantees excellent service and quality
  • Made in the USA with exceptional technology for Americans by Americans
Square Plug Wiring Extension

Square Plug Wiring Extension

The Curt 4-way square extension allows you to have full control over your trailer brakes for a safe, easy and convenient towing process. You can slow it down or let it accelerate to match your vehicle's speed all from your car seat without worrying about the trailer's brake controller.

Wiring Protection

Wiring Protection

The wiring extension is wrapped in a slit look sleeve that contains all the wiring. It protects it from being cut or damaged by road, weather and technical elements. This ensures full safety, durability and convenience.

Easy Installation

Easy Installation

The Curt 4-way square extension is easy to install. It is an easy and practically effortless plug-and-play operation, and you'll be towing away in less than 10 minutes. One end snaps into the vehicle socket while the other connects with any Curt trailer brake controller.

Limited Lifetime Warranty

Limited Lifetime Warranty

Curt provides a limited lifetime warranty for every purchase of the wiring extension. It is a guarantee of unbeaten quality and performance beyond satisfactory. Feel free to get in touch with PartCatalog if you ever need help with your warranty.

Made in the USA

Made in the USA

This extension is made in the USA by local labor with locally processed materials. The manufacturer creates employment for thousands of Americans every year and supports the growth of local industries.

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This product comes with the manufacturer's limited warranty to be free from defect under normal use and service, ordinary wear and tear excepted, for the period of the manufacturer's warranty. Subject to manufacturer limitations.
Part Numbers

The following part numbers are available in this product line:


To purchase this product for your vehicle, please select the Year, Make and Model of your vehicle at the top of this page.

Cadillac (2014-2017)

Escalade, Escalade ESV

Chevrolet (2014-2017)

Silverado 1500, Silverado 2500 HD, Silverado 3500 HD, Suburban, Suburban 1500, Suburban 3500 HD, Tahoe

GMC (2014-2017)

Sierra 1500, Sierra 2500 HD, Sierra 3500 HD, Yukon, Yukon XL, Yukon XL 1500