Your cart is empty
Browse our catalog to find the parts you need.
These images are illustrative and may not match the product exactly. Always verify by part number — or confirm instantly with the assistant using a photo or VIN.

Post Onsite · Hardware & Fasteners
68NAB-6X8
In stock · ships from Knoxville
This is a straight male connector adapter for nylon air brake tubing.
Confirm the part fits before you buy. Applications and interchange numbers are researched and audited per part.
Verified fitment for 2 applications
Add your truck to see whether it's one of them
All confirmed applications for this part number.
Other applications
Other applications
Universal DOT air brake fitting; not vehicle-specific. Verify that your system uses 3/8" OD nylon tubing and a 1/2" NPT threaded port.
Part data verified against 5 catalog sources
Numbers this part supersedes or interchanges with. Showing 10 of 10.
Different year, make, or config? Get a confirmation against your truck in under a minute.
It joins a 3/8-inch outer diameter nylon air line (SAE J844, Type A or B) to a 1/2-inch male NPT port, commonly found on brake chambers, valves, or air tanks. The fitting is made of brass, meets DOT FMVSS 571.106 air brake performance requirements, and has a pre-applied thread sealant for reliable, leak-free connections. It is typically replaced when a fitting is damaged, corroded, or leaking, or when installing new air lines in a heavy-duty truck, trailer, or bus air system.
Part Number: 68NAB-6X8
3/8 TUBE X 1/2 NPT AB ADAPT
Unit: ea
Dealer: Post Onsite
Compatibility, alternatives, and more