PowerMate Vx 136-0077RP Pressure Relief Valve is a member of a large line of PowerMate genuine replacement parts. The PowerMate Vx Pressure Relief Valve releases when too much pressure has built up in the air compressor tank. The PowerMate Vx Pressure Relief Valve is a safety must when operating an air compressor. PowerMate is one of the world's leading brands of portable and standby electric generators, air compressors, water pumps, air tools, pressure washers, and accessories.