Temperature and Pressure Relief Valve Inlet Type MNPT Outlet Type FNPT Inlet Size 3/4 in Outlet Size 3/4 in Thermostat Length 1 7/8 in Body Height 6 1/2 in 500 000 BtuH Factory Set Pressure 150 psi Max Temp 210 Degrees F Shank Length 2-5/16 in Auto Re-Seating Yes Body Material Bronze Spring Material Stainless Steel Body Width 1 15/32 in Standards ANSI Z21.22 ASME CSA Compliance ASME Boiler Code SECT IV