Cast iron; cast steel; iron pipe fittings and steel pipe fittings, such as malleable iron pipe fittings and stainless steel fittings; steel pipes and tubes; synthetic resin coated steel pipes and tubes; corrugated steel pipes and steel tubes; metal junctions for pipes and tubes; metal junctions for corrugated pipes and tubes; pipe supports of metal; flanges of metal and metal pipe collars; [ and ] valves of metal, other than parts of machines