Durable solid brass of high strength and hardness with a longer service life, strong and durable. Brass for corrosion resistance, high temperature ductility and low magnetic permeability, solid brass can withstand up to 100 °C (212 °F) High quality and deep threads allow the fittings to bite better, tight threads, not easy to slip These fittings contain lead and are not allowed by federal law to be installed for potable (drinking) water use in the U.S.A. and its territories.