Pressure Switch, Air Compressor, Manual Switch Action None, (4) Port, 1/4 in FNPT, Pressure Switch Factory On/Off Setting 105/135 psi, 1/4 in Compression Pressure Switch Unloader, Pressure Switch Differential 25 to 65 psi, Pressure Switch Range 25 to 160 psi, Pressure Switch Electrical Contact Form DPST, Pressure Switch Action Standard, NEMA Rating 1, Series MDR11, HP @ 1 Phase - 120V 2 hp, HP @ 1 Phase - 240V 3 hp, Temp. Range -22 Degrees to 257 Degrees F, Standards CSA Certified, UL Listed