Safety Relief Valve, Body Material Cast Bronze, Inlet Type MNPT, Outlet Type FNPT, Inlet Size 1 in, Outlet Size 1 in, Factory Set Pressure 15 psi, Pressure Range 5 to 15 psi, 643,000 BtuH BtuH, Disc Material EPDM, Overall Height 2 1/16 in, Application Low Pressure Steam Heating and Supply Boilers, Overall Length 5 3/8 in, Seat Material EPDM, Spring Material Stainless Steel, Temp. Range 0 Degrees to 250 Degrees F, Test Lever Test Lever Included, Standards CRN