Drain pipes of metal; Gutter pipes of metal; Metal tubs; Penstock pipes of metal; Pipe muffs of metal; Pipework of metal; Rope thimbles of metal; Steel tubes; Water-pipe valves of metal; Water-pipes of metal; Branching pipes of metal; Ducts of metal for ventilating and air-conditioning installations; Ducts of metal, for central heating installations; Elbows of metal for pipes; Junctions of metal for pipes; Manifolds of metal for pipelines; Metallic drain traps; Pipes of metal, for central hea...