Tube or pipe fittings (e.g. couplings, elbows, sleeves), of iron or steel

730711 Cast iron; cast fittings, of non-malleable cast iron 730719 Iron or steel; cast fittings, other than of non-malleable cast iron 730721 Steel, stainless; tube or pipe fittings, flanges, of stainless steel 730722 Steel, stainless; tube or pipe fittings, threaded elbows, bends and sleeves 730723 Steel, stainless; tube or pipe fittings, butt welding fittings 730729 Steel, stainless; tube or pipe fittings, n.e.c. in item no. 7307.2 730791 Iron or steel; tube or pipe fittings, flanges, other than stainless steel 730792 Iron or steel; tube or pipe fittings, threaded elbows, bends and sleeves, other than stainless steel 730793 Iron or steel; tube or pipe fittings, butt welding fittings, other than stainless steel 730799 Iron or steel; tube or pipe fittings, n.e.c. in item no. 7307.9, other than stainless steel