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Imperial · Air System
90740
In stock · ships from Knoxville
This is a 3/8-inch brass insert, often called a tubing support sleeve, used inside nylon air brake lines at compression fittings.
Confirm the part fits before you buy. Applications and interchange numbers are researched and audited per part.
We don't publish fitment for this part yet. Rather than guess, get it confirmed against your truck in under a minute.
It prevents the soft tubing from collapsing when the fitting nut is tightened, ensuring a solid, leak-free connection. These inserts are standard maintenance items on heavy‑duty trucks and trailers whenever a section of air line is replaced or a fitting is removed. They help maintain a DOT‑compliant air brake system by keeping the tubing round under pressure.
Part Number: 90740
3/8 AIR LINE INSERT
Vendor: Imperial
Dealer: KP Services Crossville
Compatibility, alternatives, and more
Parts commonly needed alongside air system
