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Post Onsite · Hardware & Fasteners
268-6-4
In stock · ships from Knoxville
This is a brass adapter fitting used to connect a 3/8-inch polytube (often nylon air line) to a 1/4-inch male BSPT (British Standard Pipe Taper) threaded port.
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 uses a compression-style nut and sleeve to grip the tubing, creating a reliable, leak-free connection without needing thread sealant on the tube side. These fittings are commonly used in air brake, air suspension, and other pneumatic systems on trucks and trailers when you need to adapt a plastic air line to a threaded component. You would replace it if the old fitting is corroded, the threads are damaged, or the compression sleeve no longer holds the tube securely.
Part Number: 268-6-4
FITTING 268-6-4
Unit: ea
Dealer: Post Onsite
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