5/8" O.D. (1/2" I.D.). Flexible stainless steel corrugated tubing with stainless fittings. For use with indoor and outdoor connections of gas appliances to gas piping system. May be used with natural, manufactured, mixed and liquefied petroleum (LP or propane) gases and LP gas-air mixtures. A.G.A. approved for indoor or outdoor use according to ANSI Z21.24 and Z21.45. 3/4" Male I.P.S. x 3/4" Female I.P.S. fittings. 1 per bag.