• Close up shot of Coupler cork installed.
  • Install of Coupler Cork Video
  • A pile of machined silver aluminum coupler corks with resting on a blue workbench in an industrial workshop setting with a CNC machine in the background.
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Coupler Cork

Coupler Cork

$19.97 USD
$19.97 USD
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Low stock: 39 left

Color: Black
Material
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Don't Leave Your Air Coupler Wide Open.

Your onboard air system lives where dirt, mud, dust, sand and water are part of the territory. An exposed quick-connect coupler gives all of it somewhere to go.

The CMM Offroad Coupler Plug provides a simple, purpose-built way to protect an unused female air coupler until you're ready to connect your hose.

Precision CNC-machined in the USA, the Coupler Plug snaps directly into a compatible female quick-connect fitting just like the mating air fitting would. Once installed, it helps prevent contaminants from reaching the internal components of the coupler.

Choose Your Material

6061-T6 Aluminum
Our standard Coupler Plug provides an excellent combination of durability, corrosion resistance and lightweight performance.

7075-T6 Aluminum
For customers who want the premium option, our 7075 version provides substantially higher material strength while maintaining the same compact design.

Cerakote® Finished

Every CMM Coupler Plug receives a Cerakote finish for additional surface protection and the finished appearance you'd expect from CMM Offroad.

Available in:

  • Black Cerakote

  • USMC Red Cerakote

Designed for Onboard Air

Designed for compatible 1/4" quick-connect female air couplers commonly found on onboard-air systems using 3/8" air hose.

Ideal for couplers mounted on:

  • Bumpers

  • Underhood air systems

  • Compressor installations

  • Air tanks

  • Air manifolds

  • Exterior air connection points

  • Shop and service equipment

Retain It. Don't Lose It.

Each Coupler Plug includes a stainless steel split-ring retainer, providing a durable attachment point for tethering the plug near the coupler so it's there when you need it.

Product Details

  • CNC machined aluminum construction

  • Choice of 6061-T6 or 7075-T6 aluminum

  • Cerakote® protective finish

  • Black and USMC Red color options

  • Stainless steel split-ring retainer included

  • Helps block dirt, mud, sand, dust and moisture

  • Quick push-in installation and removal

  • Reusable

  • Compact, lightweight design

  • Designed and machined in the USA

Small Part. Important Job.

You've invested in your compressor, air lines, fittings and onboard-air system. Don't leave the connection point exposed.

Plug it. Protect it. Hit the trail.

View full details

Customer Reviews

Overall rating: 5.0 / 5 from 12 reviews.

Customer photo review of Coupler Cork

The CMM Offroad Coupler Cork does exactly what it should: snaps in clean, keeps dirt and water out of the air fitting, and the split-ring + lanyard means you won’t lose it on the trail. Quality feel, USA-made, and it looks like it belongs on the rig. Worth it.

Marc L. 5/5 Verified

Coupler Cork

Simple but great tool! I did put an o-ring to truly cover the gap.

Jason N. 5/5 Verified

Coupler Cork

Store owner replied: Understand and good point. We could send with the ring. We currently did not do this as the plug gives more depth if needed. The gap does not effect the ability. Thank you for the feedback.

The plug worked perfectly and should help to keep crud out of my quick connect.

Damon B. 5/5 Verified

Coupler Cork

great product, its great being able to secure it with a zip tie so it wont get lost. it keeps your air chuck free from the trail debris.....good job guys

Darrell M. 5/5 Verified

Coupler Cork

I’ve been saying forever that there should be a way to plug that fitting so dirt and debris doesn’t get in it! Then you guys came up with this Coupler Cork ! I love it!!! Thanks CMM!!!!!

Robert L. 5/5 Verified

Coupler Cork

Worked great

Wayne N. 5/5 Verified

Coupler Cork

When I seen it advertised I wasn’t sure why this hasn’t been a thing before. I like the fact that I can cover my air lines so that dust and debris doesn’t get in and ruin my gauges and stuff.

Rory C. 5/5 Verified

Coupler Cork

Fits great

Jonathan R. 5/5 Verified

Coupler Cork

Works great and looks great!

Rick W. 5/5 Verified

Coupler Cork

Perfect fit, fast shipping! Great company to work with!

Tony H. 5/5 Verified

Coupler Cork