17 Fittings, not of metal, for pipes; Pipe joint compound; Pipe joint tape; Pipe jointing compounds; Fittings, not of metal, for flexible pipes; Fittings, not of metal, for rigid pipes; Flexible pipes, not of metal; Flexible plastic pipes for plumbing purposes; Flexible plumbing pipes of plastic; Flexible PVC pipes; Junctions for pipes, not of metal; Non-metal fittings for pipes; Non-metal elbows for pipes; Non-metal junctions for pipes; Watertight rings for plumbing pipes