Series 1L, 1XL Temperature and Pressure Relief Valves are used in water heater and hot water storage tank applications to provide automatic temperature and pressure protection to hot water supply tanks and hot water heaters up to 15,000 BTU/hr. They feature a bronze body with NPT threaded male inlet and NPT threaded female outlet connections, unique thermostat with special thermo-bonded coating and test lever. Series 1L, 1XL are CSA listed. Model 1L has 2 in. (50mm) thermostat and a test lever. Model 1XL has an extension thermostat. Temperature Relief: 210°F (99°C), Pressure Relief Range: 75 to 150psi (5.2 to 10.3 bar), Standard Pressure Settings: 75, 100, 125, or 150psi (5.27, 7.03, 8.79, or 10.55 bar). Have a bunch of these. The more you buy the cheaper the price. Please email any questions.