D4497 Safety Relief Valve Body Material Bronze Inlet Type MNPT Outlet Type FNPT Inlet Size 1 1/4 in Outlet Size 1 1/2 in Factory Set Pressure 150 psi Pressure Range 15 to 250 psi Disc Material 316 Stainless Steel Overall Height 10 1/4 in Application Air and Gas Compressors and Dryers Pressure Vessels and Pressure Piping System etc Overall Length 2 3/8 in Seat Material Metal Spring Material Stainless Steel Temp Range -320 Degrees to 406 Degrees F Test Lever No Compliance ASME