Used to lock the low pressure exhaust valve, so that the braking system on PV2/PV4 can exhaust quickly and easily.
Suitable for all popular non-adjustable GM type combination valves
Suitable for DISC/DISC, DISC/DRUM PV2 and PV4, AC Delco 1S72-1353, 172-1371
Specially designed for CPP proportional valve to Help you to lock the low pressure exhaust valve, make braking system bleeding more easy and fast ,prevent the combined valve from tripping