... : Widely used in various pipelines to convey gas,water,and oil. O Brand Two Times Galvanized Malleable Iron Pipe Fitting union gasket ... , black 4.TUV,UL5. Brand: O Product Itemcast iron pipe fitting : elbows, tees, sockets, bends, nipples, unions, crosses, flanges, plugs, backnuts ... , oil, air O Brand Two Times Galvanized Malleable Iron Pipe Fitting union gasket