POP Safety Relief Valve, Body Material Bronze, Inlet Type MNPT, Outlet Type FNPT, Inlet Size 1/2 in, Outlet Size 3/4 in, Factory Set Pressure 515 psi, Pressure Range 15 to 1200 psi, Disc Material 316 Stainless Steel, Overall Height 5 5/8 in, Overall Length 9 1/2 in, Seat Material Metal, Spring Material Stainless Steel, Temp. Range -320 Degrees to 422 Degrees F, Test Lever Test Lever Included, Standards CRN