6
copper, unwrought or semi-wrought; valves of metal, other than parts of machines; junctions of metal for pipes; water-pipes of metal; building materials of metal; construction materials of metal; clips of metal for cables and pipes; nuts of metal; fittings of metal for furniture; flanges of metal [collars]; chests of metal; bins of metal; Copper pipes; copper rings
17
synthetic rubber; Couplings of rubber for pipes; junctions, not of metal, for pipes; plastic substances, semi-processed; connecting hose for vehicle radiators; flexible hoses, not of metal; Fiberglass insulation materials for buildings; Insulating material; Stuffing of rubber or plastic; fittings, not of metal, for flexible pipes
19
Waterproof bituminous membranes reinforced with glass fibre; bitumen; Luminous paving; water-pipe valves, not of metal or plastic; Drain traps [valves], not of metal or plastic; Plastic pipes for plumbing purposes; rigid pipes, not of metal, for building; water-pipes, not of metal; branching pipes, not of metal; Non-metal sewer pipes