Watts ASME Water Pressure Relief Valves Series 740-75, 3/4 x 1" (0382456)

Set pressure 75 PSI. BTU/hr Steam Pressure Discharge Capacity 1, 886, 000 for pressure protection of hot water heating boilers. Iron body construction safety relief valves for pressure protection only of all types of hot water heating boiler equipment with expanded outlets for hot water space heating boilers. Seat located above drain; water can't be trapped and sediment can't foul seat. Non-mechanical seat-to-disc alignment will not stick or freeze. Water seal of high temperature resisting material isolates spring working parts from water during relief. Important: The discharge line must be the same size as the valve outlet, and must pitch downward from the valve to a safe place for disposal.