Rigid pipes and valves in the nature of water-pipe valves, not of metal or plastic and junctions in the nature of building materials, namely, plastic pipe supports therefor, non-metallic; fluid conveying rigid pipes not of metal; insulated pipes for water not of metal; sluice gates of non-metallic materials for controlling the flow of liquids, namely, water-pipe valves, not of metal or plastic; plastics pipes for water