When selecting gas pipe for your home, LDR pipe and fittings are the way to go. The durable black iron is 100% pressure tested and protected right at the factory.   Features:   Black malleable iron construction Not for use with drinking water Maximum working pressure of 150 psi Varnish helps protect fitting from corrosion Hydrostatically tested Meets ASTM standards For use on natural gas, liquefied petroleum or air supply lines UL and FM certified