19 Building glass; Building materials, namely, plastic pipe supports; Concrete building materials, namely, blocks, bricks, posts, slabs and panels; Marble; Water-pipes, not of metal; Wood tile floors; Non-metallic drainage pipes; Prefabricated non-metal buildings; Sealer coatings sold as an integral component of non-metal tiles, natural stone, and molded resins for construction purposes; Water-pipe valves, not of metal or plastic