Water storage towers, not of metal; Branching pipes, not of metal; Non-metallic air pipes for buildings; Non-metallic discharge pipes for building installations; Non-metallic drainage pipes; Non-metallic pipes (drain); Non-metallic pipes for building purposes; Non-metallic pipes for roof drainage installations; Non-metallic rigid pipes; Non-metallic rigid pipes for construction purposes; Non-metallic sewer pipes; Non-metallic water fittings incorporating flow control (parts for water pipes); Non-metallic water pipes (other than parts of sanitary installations); Plastic pipes (rigid) for water; Rigid non-metallic pipes for building (other than parts of sanitary installations); Rigid pipes (not of metal); Rigid pipes not of metal (building); Rigid pipes of plastics (other than parts of sanitary installations; Water regulating valves (not of metal or plastic) for water pipes; Water-pipes, not of metal; Manhole covers, not of metal; Non-metallic building materials for use in setting manholes; Non-metallic manhole covers; Non-metallic manhole frames; Non-metallic manholes; Non-metallic linings for tunnels; Non-metallic materials for use in the construction of tunnels; Non-metallic tunnels; Air ducts of non-metallic materials for buildings; Ducting installations (non-electric, non-metallic); Ducts, not of metal, for ventilating and air-conditioning installations; Non-metallic air ducts for buildings; Non-metallic ducts for ventilating and air conditioning installations; Non-metallic venting ducts; Pre-formed non-metallic floor ducts (other than electric); Channels of non-metallic materials for transmitting air for ventilation; Sewer liners of plastic material; Drain channels, not of metal; Drain covers, not of metal; Drain pipes, not of metal; Drain traps (valves), not of metal or plastic; Drains (other than of metal or plastic); Non-metallic covers for drainage channels; Non-metallic drainage apparatus; Non-metallic drainage channels; Non-metallic drainage courses; Non-metallic drainage products for use in building; Non-metallic drainage products for use in roofing; Non-metallic industrial drainage apparatus; Rainwater drainage apparatus of plastic materials; Rigid channels for drainage (non-metallic); Non-metallic building materials for flood protection; Building materials of plastic material; Non-metallic building materials for civil engineering; Non-metallic building materials for roofs; Non- metallic building materials in the form of plastic extrusions; non-metallic pipes for building culverts, road crossings and tunnels to allow passage of water under or beside a road way