Plastic substances, semi-processed; plastics in extruded form for use in manufacture; flexible tubes, not of metal; pipe muffs, not of metal; water-tight rings; rubber sleeves; junctions, for pipes, not of metal

Pipes (Rigid-) not of metal (building); branching pipes, not of metal; water-pipe valves, not of metal or plastic; mouldings, not of metal, for building; aeration tubes, not of metal, for the penetration of gases and liquids, especially waste-water