Nozzles of metal, namely, wash down spray nozzles for commercial and industrial use of metal, non-automatic fueling nozzles of metal; jets of metal being wash down spray nozzles for commercial and industrial use of metal; ducts of metal, for central heating installations; water-pipes of metal; elbows of metal for pipes; drain pipes of metal; valves of metal, other than parts of machines; pipework of metal; water-pipe valves of metal; ducts of metal for ventilating and air-conditioning installations