Series 100XL 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 105,000 BTU (British Thermal Unit)/hr (hour). They feature a bronze body with NPT (nominal pipe thread) male inlet and NPT female outlet connections, unique thermostat with special thermo-bonded coating and a test lever. Series 100XL is ASME (American Society of Mechanical Engineers) rated and CSA (Canadian Standards Association) listed. Manufactured to include no more than 0.25% weighted average lead content on wetted surfaces.