branching pipes, not of metal; rigid pipes, not of metal, for building; water-pipes, not of metal; rigid pipes of polypropylene for building; plastic pipes for conveying natural gas; drainage pipes, not of metal; sewer pipes, not of metal; valves, not of metal or plastic, for water pipes; water pipes, not of metal; plastic pipes for plumbing purposes; non-metallic rigid pipes for building; water-pipe valves, not of metal or plastic; polyethylene pipes used in geothermal heating and cooling systems; drain pipes made of concrete, earthenware or sandstone; rigid underdrainage pipes, not of metal; non-metal water pipes; drain pipes, not of metal; rigid polypropylene pipes for building