D4506 POP Safety Relief Valve Body Material Stainless Steel Inlet Type MNPT Outlet Type FNPT Inlet Size 3/4 in Outlet Size 1 1/4 in Factory Set Pressure 300 psi Pressure Range 15 to 900 psi Disc Material 316 Stainless Steel Overall Height 9 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 800 Degrees F Test Lever No Standards ASME Section VIII UV CSA CRN NB