Unloader valve (continuous run unloader) for gas & electric powered air compressors 95-125 factory setting. pressure can be adjusted 30-40 psi up or down 3/4" Female Pipe Thread Inlet x 3/4" Female Pipe Thread outlet. comes complete with hand unloader and muffler/silencer. 60 scfm Rating Piloted discharge check valves combine a pilot valve, a discharge valve, and a check valve into one system used to run an air compressor at a constant speed. They are used on both gas engine and electric motor compressors.