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