Section 15 Base metals and articles of base metal 73 Articles of iron or steel 73 07 Tube or pipe fittings (for example, couplings, elbows, sleeves), of iron or steel 73 07 92 - - Threaded elbows, bends and sleeves 73 07 92 00 - - Threaded elbows, bends and sleeves Commodity Code Description 73 07 92 00 000 - - Threaded elbows, bends and sleeves