Tractor and Trailer Airline Couplings

These BS AU 138a:1980 and BS AU 138b:2000 couplings include an Emergency Line, Service Line, and Auxiliary Line for improved safety and efficiency. Experience the benefits of a professional and scientifically designed coupling with easy-to-use features.

Expertly designed for trucks and tractors, these couplings feature a self-sealing valve for maximum safety. Available in 1/2"BSP and M22 fittings, the couplings can be purchased as an assembly or separately. Designed with a suitable sealant and without the use of aluminium washers.

Upgrade your tractor and trailer with the latest in airline coupling technology. Our couplings feature a self-sealing valve, female C coupling, and a valve lifter for easy use. Also includes a Male CA coupling and C-Locks for secure transportation.