Branching pipes, not of metal; Non-metal ducts; Non-metal vent cover for HVAC ducts; Non-metal ventilating ducts; Pipes of cement, earthenware or sandstone; Plastic conduit for drainage and irrigation; Plastic water conduits for roofs and balconies; Rigid pipes of polypropylene for the supply of drinking water and heating and air conditioning systems in houses, office buildings and industrial buildings; Rigid pipes, not of metal, for building; Water-pipe valves, not of metal or plastic