Product Design: The 1/2 inch x 1/2 inch npt brass fitting is an adapter for connecting two NPT female threaded pipes Premium Materials: Brass for corrosion resistance, ductility at high temperatures, and low magnetic permeability Wide Application: This pipe fitting can apply to water, air, gas, oil, and fuel High Quality Threads: High quality and deep threads allow the fittings to bite better, not easy to slip Note: This product can expose you to chemicals including lead(1.8%~3.7%), which is not allowed by federal law to be installed for potable water use in the U.S.A. and its territories Male National Pipe Taper (NPT) threads for connecting to Female threaded pipes. Note: This product can expose you to chemicals including lead(1.8%~3.7%), which is not allowed by federal law to be installed for potable water use in the U.S.A. and its territories