Maintain proper braking with one of these brake booster check valves which is often located on the brake booster assembly. This is a one-way check valve that allows the vacuum to build up in the brake booster and prevent vacuum from leaving the brake booster assembly. This gives the brake booster a consistent supply of vacuum needed to assist the driver when braking. Made from ABS plastic.
Suits 18.75mm (0.738") hole, Check Valve push in bar is 15.50mm (0.610") and the Barb is 9.52mm (3/8")