Temperature and pressure relief valve for direct installation into hot water tank. Rated for 150 P.S.I. pressure and 210 temperature. 3 3/4" thermostat probe projection. Protects water heaters to 100,000 BTU per hour. 3/4" M.I.P.S. inlet and 3/4" F.I.P.S. outlet. 3/4". Manufactured to include no more than 0.25% weighted average lead content on wetted surfaces.