3/4", Lead Free, Temperature & Pressure Relief Valve, With 4" Thermostat, For Water Heaters Up To 105,000 BTU, ProvidesFully Automatic Temperature & Pressure Relief Protection, Comes With Test Lever & Extension Thermostat For InstallationIn The Hot Water Outlet Line Or Directly In The Tank Tapping, Temperature Sensing Element Must Be Immersed In The WaterWithin The Top 6" Of The Tank, 3/4" Male Inlet & 3/4" Female Outlet, Temperature Relief 210 Degrees Fahrenheit & 150 PSI Pressure, Lead Free Certified To Federal Law.