"C" Coupling Tester
If a tractor is fitted with self-sealing air brake "C" couplings a corresponding valve-lifter must be fitted to the trailer service coupling. As it is not possible to see if the self-sealing valve is opening correctly when the couplings are connected, the trailer service coupling needs to be checked separately with a tester to verify the correct operation of the valve-lifter.
Part No. VLT 3500