STZ Industries 4 in. FIP each X 4 in. D FIP Black Malleable Iron 90 Degree ElbowWhen selecting gas pipe for your home STZ pipe and fittings are the way to go. Our durable black iron fittings are tested directly at the factory. Fittings, nipples, and pipe come in an array of sizes to meet your home's gas, air, and LP needs. Use for above ground gas, LP and air applications Rated at maximum 300 psi at 150F 100% Pressure tested at the factory UL and FM listed Not for use with potable drinking water Not for use in underground