3/4", lead free thermostatic mixing valve, female pipe thread, hot water temperature control valve at the point of origin in domestic hot water systems to reduce temperature of the hot water supply, double throttling design combines control of hot & cold water to provide sensitive response to changes in water temperature, provides additional safety by restricting water flow to a trickles upon loss of cold water, bronze body, locking safety cap with Allen wrench, maximum temperature 200 degree Fahrenheit, maximum working pressure 150 psi, asse 1017 listed, csa b-125 certified.