Series 340, 340X Automatic Reseating Temperature and Pressure Relief Valves are used in commercial water heater applications to provide automatic temperature and pressure protection to hot water supply tanks and hot water heaters. They feature a bronze body with NPT male inlet and NPT female outlet connections, stainless steel spring and thermostat tube, tamper-resistant bonnet screws, automatic reseating feature, and test lever. Model 340 has a 3 in. (80mm) thermostat. Model 340X has an 8 in. (200mm) thermostat. Series 340, 340X are ASME rated and CSA listed. Temperature Relief: 210°F (99°C), Pressure Relief Range: 75 to 150psi (5.2 to 10.3 bars), Standard Pressure Settings: 75, 100, 125, or 150psi (5.27, 7.03, 8.79, or 10.55 bars). Size Range: 1 1/2 in. (38mm)