This 3/4 inch pressure relief valve is used in hot water heating and domestic supply boiler applications. It protects against excessive pressures on all types of hot water heating supply boiler equipment. This valve consists of a bronze body construction with NPT threaded male inlet and NPT threaded female outlet (drain) connection, non-metallic disc-to-metal seating, stainless steel spring, and test lever. It resists corrosive water conditions, sticking, and freezing. It prevents water and sediment from being trapped in the seat. This valve is designed for emergency safety relief and is not be used as an operating control. The pressure setting is 125 PSI for applications up to 1,700,000 BTU/hr.