Ceramic drain pipes; Downspouts, not of metal; Gutter pipes, not of metal; Multi-layer water conservation textile designed for nurseries, greenhouses and garden centers; Non-metal down spouts; Non-metal rigid tubing; Non-metal sewer pipes; Non-metal ventilating ducts; Non-metal water pipes; Non-precious stones for garden or ornamental use; Plastic conduit for drainage; Plastic conduit for irrigation; Plastic water conduits for roofs and balconies; Water-pipe valves, not of metal or plastic; Water-pipes, not of metal
Nonmetallic Building Materials