and physical frame size

ensuring stable evaporator performance even under fluctuating load conditions

low-friction interface for 5/16-inch diameter push rods

when mounted within its designated NEMA-rated enclosure

Unlike standard direct-acting regulators

Watts 0156731 Valve 320788-703 and physical frame sizeThe Watts 0156731, specifically the 40XL 5 150, is a high capacity T&P relief valve engineered for heavy duty protection of water heaters and storage tanks. Featuring a 3 4 inch NPT inlet and outlet, this temperature and pressure relief valve is factory set at 150 PSI with a maximum temperature threshold of 210F. The 40XL series is built with a bronze body and features an extended thermostat probe to ensure accurate thermal sensing in the top 6 inches