Vacuum Relief Valve Body Material Brass Inlet Type NPT Outlet Type Vented Inlet Size 1/2 in Outlet Size 1/2 in Factory Set Pressure 5 psi Pressure Range 0 to 200 psi 500 000 BtuH Steam Capacity (Lb./Hr.) 200 lb/hr Disc Material Silicone Overall Height 2 1/2 in Application Water Heater Pressure Relief Overall Length 1 3/4 in Seat Material Silicone Spring Material Stainless Steel Temp Range 0 Degrees to 210 Degrees F Test Lever No Compliance ANSI Z21.22/CSA 4.4