British Standard AU 138a:1980

BS AU 138a:1980 couplings comprise of an Emergency Line, Service Line and Auxiliary Line. Improved coupling design available here.

Truck/Tractor Couplings:

  • Tractor couplings must always have a self-sealing valve fitted.

  • On the Emergency Line there will be a Female Self-Sealing valve and a Female C Coupling.

  • On the Service Line there will be a Male Self-Sealing valve and a male coupling.

  • On the Auxiliary line there will be a Female Self-Sealing Valve and a Female CA coupling

  • All of these couplings are available in 1/2"BSP and M22 fittings.

  • The Self-Sealing valve can be purchased as an assembly with the coupling or each part may be purchased separately.

  • Couplings should be assembled with a suitable sealant and aluminium washers should not be used.

 

Trailer Couplings:

  • The trailer does not need a self-sealing valve.

  • On the Emergency Line there will be a male coupling.

  • On the Service Line there will be a Female C coupling and a valve lifter (to open the self-sealing valve).

  • On the Auxiliary Line there will be a Male CA coupling.

  • Secure your Trailer with our C-Locks (link to C-Locks)

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