Range 0 Degrees to 450 Degrees F, Test Lever No Adjustable Relief Valve, Body Material Bronze, Inlet Type MNPT, Outlet Type FNPT, Inlet Size 1 1/2 in, Outlet Size 1 1/2 in, Factory Set Pressure 300 psi, Pressure Range 251 to 300 psi, Disc Material Bronze, Overall Height 9 3/4 in, Application Liquids, Seat Material Bronze, Spring Material 316 Stainless Steel, Temp.