This is a factory-calibrated safety device

ensuring reliable performance in both heating and cooling applications

A standard orifice wrench or deep-well socket is recommended to ensure the part is seated squarely without damaging the precision-machined edges

verify the mounting pattern and shaft diameter

Watts 0274683 Valve 320734-701 This is a factory-calibrated safetyFor high output heating systems requiring robust overpressure protection, the Watts 0274683 (Series 174A 100) is a critical component for both residential and commercial hot water supply boilers. This 3 4 inch pressure relief valve is engineered with a durable bronze body and features an ASME Section XIII certification, ensuring it meets rigorous safety standards for emergency relief. With a factory set point of 100 PSI and a high steam discharge