Features: * Used in hot water boiler applications to protect against excessive pressure on all type of hot water heating boiler equipment * Iron body construction with forged bronze inlet connections non-metallic disc-to-metal seating stainless steel spring and test lever * Resists corrosive water conditions, sticking and freezing, and prevents water and sediment from being trapped in the seat * Designed for emergency safety relief and shall not be used as an operating control * Standard pressure setting: 30 PSI * Pressure range: rated up to 550000 BTU/hr at 30 PSI (2 bar) setting only * 3/4 inch size What"s In The Box: * Watts 374A 3/4-Inch 30 PSI Boiler Relief Valve