Stock: 27
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.
Check Your Fitment: Industrial (B-Style)
This Coupler Cork fits 1/4" Industrial, ISO 6150 Series B, Fed Spec A-A-59439 couplers, also known as B-Style.
Running an automotive coupler instead? Automotive 1/4" Tru-Flate (T-Style) couplers use a different plug profile and are not interchangeable with B-Style. Look for our Coupler Cork – Automotive (Tru-Flate / T-Style).
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:
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Black Cerakote
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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:
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Bumpers
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Underhood air systems
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Compressor installations
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Air tanks
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Air manifolds
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Exterior air connection points
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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
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CNC machined aluminum construction
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Choice of 6061-T6 or 7075-T6 aluminum
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Cerakote® protective finish
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Black and USMC Red color options
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Stainless steel split-ring retainer included
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Fits 1/4" Industrial ISO 6150 Series B (B-Style) couplers
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Helps block dirt, mud, sand, dust and moisture
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Quick push-in installation and removal
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Reusable
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Compact, lightweight design
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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.