Adjustable Back Pressure Relief Valve, Body Material Bronze, Inlet Type FNPT, Outlet Type FNPT, Inlet Size 1 1/4 in, Outlet Size 1 1/4 in, Factory Set Pressure 400 psi, Disc Material Metal, Overall Height 9 3/4 in, Application Pump systems, hydraulic systems, oil burningequipment, rams, presses and lifts, chemicalsprocesses, waste treatment, desalination andcar washes, Overall Length 4 1/2 in, Seat Material Bronze, Spring Material Stainless Steel, Temp. Range 40 Degrees to 450 Degrees F