Temperature & pressure hot water heater 1-1/2" relief valve number 340-3 set at 150lbs. Has a 3" thermostat extension probe, AGA BTU rating 1,150,000.
Temperature & pressure safety relief valves are designed for water heaters to protect against overpressure conditions. Bronze body, with thermo-bonded coating on the thermostat probe retards the accumulation of mineral deposits. Maximum pressure of 150lbs and 210 degrees F.