Pressure Only Relief Valve, Body Material Bronze, Inlet Type MNPT, Outlet Type FNPT, Inlet Size 3/4 in, Outlet Size 3/4 in, Factory Set Pressure 150 psi, Pressure Range 75 to 150 psi, 500,000 BtuH, Disc Material Silicone, Overall Height 3 in, Application Hot Water Supply Systems, Seat Material Silicone, Spring Material Stainless Steel, Temp. Range 0 Degrees to 210 Degrees F, Test Lever Yes, Standards Certified ANSI Z21.22, CSA 4.4, Listed And Rated By ASME And CSA