Vacuum Relief Valve, Body Material Brass, Inlet Type MNPT, Outlet Type MNPT, Inlet Size 1/2 in, Outlet Size 1/2 in, Factory Set Pressure Not Applicable, Pressure Range Up to 15 psi Steam/Up to 200 psi Water, Not Applicable BtuH, Disc Material Silicone, Overall Height 2 in, Application Water Heaters/Tanks, Overall Length 2 in, Spring Material 302 Stainless Steel, Temp. Range 0 Degrees to 250 Degrees F, Test Lever Test Lever Not Included, Standards ANSI Z21.22, CSA