D4499 POP Safety Relief Valve Body Material Bronze Inlet Type MNPT Outlet Type FNPT Inlet Size 1 1/2 in Outlet Size 2 in Factory Set Pressure 175 psi Pressure Range 15 to 300 psi Disc Material 316 Stainless Steel Overall Height 13 1/4 in Application Air and Gas Compressors and Dryers Pressure Vessels and Pressure Piping System etc Seat Material Metal Spring Material Stainless Steel Temp Range -320 Degrees to 406 Degrees F Test Lever No Standards ASME Section VIII UV CSA CRN NB