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Imperial · Air System
90739
In stock · ships from Knoxville
This is a 1/4-inch brass or stainless steel insert used inside a DOT-approved compression fitting for nylon air brake tubing (SAE J844 Type A or B).
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Verified fitment for 1 applications
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Other applications
Other applications
This is a generic 1/4-inch air line insert for DOT compression fittings. It fits any heavy-truck or trailer air system that uses 1/4-inch nylon tubing with the corresponding compression nut and sleeve.
Part data verified against 2 catalog sources
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It slips inside the end of the air line to support the tubing wall, allowing the compression nut and sleeve to create a tight, leak-free seal. These inserts are commonly replaced whenever an air line is disconnected or if a joint develops a leak, as the insert can become deformed over time. They are designed for heavy-duty air brake, suspension, and accessory air systems operating up to 150 psi.
Part Number: 90739
1/4 AIR LINE INSERT
Vendor: Imperial
Dealer: KP Services Crossville
Compatibility, alternatives, and more
Parts commonly needed alongside air system
