7307: Tube or pipe fittings, of iron or steel

730711: Fittings, pipe or tube, of non-malleable cast iron 730719: Fittings, pipe or tube, cast, of iron or steel, nes 730721: Flanges, stainless steel 730722: Threaded elbows, bends and sleeves of stainless steel 730723: Fittings, butt welding, stainless steel 730729: Fittings pipe or tube of stainless steel, nes 730791: Flanges, iron or steel, nes 730792: Threaded elbows, bend and sleeves, iron or steel, nes 730793: Fittings, but welding, iron or steel, nes 730799: Fittings, pipe or tube, iron or steel, nes 7307: Tube or pipe fittings, of iron or steel