Section 15 BASE METALS AND ARTICLES OF BASE METAL 76 Aluminium and articles thereof 76 09 Aluminium tube or pipe fittings (for example, couplings, elbows, sleeves). 76 09 00 76 09 00 00 Commodity Code Description 76 09 00 00 00 Aluminium tube or pipe fittings (for example, couplings, elbows, sleeves).