3/4 In Bronze Boiler Pressure Relief Valve, 40 psi, Threaded Female Connections_This 3/4 inch boiler pressure relief valve is used in hot water heating and domestic supply boiler applications to protect against excessive pressures on all types of hot water heating supply boiler equipment. It consists of a bronze body construction with NPT threaded female inlet and NPT threaded female outlet (drain) connections, non-metallic disc-to-metal seating, stainless steel spring, and test lever. It resists corrosive water conditions, sticking and freezing, and prevents water and sediment from being trapped in the seat. It is designed for emergency safety relief, not as an operating control. The pressure relief is set at 40 psi (275.8 kPa) with corresponding high pressure ratings up to 800,000 BTU/hr.800,000 BTU/hr._Spring loaded_Non mechanical seat-to-disc alignment will not stick or freeze_Bronze body_Automatic reseating_Specifications_Body Material Bronze_Brand Watts_Buy American Act Compliant YES_EAN 098268013078_GPM-When Relieved Does Not Apply to Product_Inlet Connection Size 3/4 IN_Inlet Connection Type Female Threaded_Inlet Thread Type NPT_Lead Free NO_Maximum Temperature-Fahrenheit 250_Maximum Working Pressure-PSI 30_Outlet Connection Size 3/4 IN_Outlet Connection Type Female Threaded_Outlet Thread Type NPT_Part Number 0274479_Pressure Range 30 to 150 PSI_Pressure Relief Setting-PSI 40_Pressure Steam Discharge Capacity 800,000 BTU per hour_Protection Type Pressure_Series 174A_Shank Length Does Not Apply To Product_Temperature Steam Discharge Capacity Does Not Apply to Product_Thermostat Material Does Not Apply To Product_Thermostat Probe Length Does Not Apply To Product