POP Safety Relief Valve Body Material Bronze Inlet Type MNPT Outlet Type FNPT Inlet Size 1 in Outlet Size 1 1/2 in Factory Set Pressure 500 psi Pressure Range 5 to 600 psi Steam Capacity (Lb./Hr.) 8 981 lb/hr 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 Seat Material Metal Spring Material Stainless Steel Temp Range -320 Degrees to 422 Degrees F Test Lever Yes