17
Rubber, gutta-percha, gum, asbestos, mica and goods made from these materials and not included in other classes; plastics in extruded form for use in manufacture; packing, stopping and insulating materials; flexible pipes, not of metal.
non-metallic pipe fittings, namely, tees, ells, male adaptors, female adaptors, couplings, caps, plugs, crosses, nipples, wyes, saddles, bushings, unions, flanges, swing joints, filters, risers, manifolds, repair couplings, expansion joints and dwv pattern fittings, non-metallic valves made of pvc, cpvc, polypropylene, polyethylene, fluorocarbons, low extractable pvc, polyvinyldienalflourine, chlorotriflourocthylene, ethylchlorotriflouroethylene, buna elastomers, epdm elastomers and flourocarbon elastomers
19
Building materials (non-metallic); non-metallic rigid pipes for building; asphalt, pitch and bitumen; non-metallic transportable buildings; monuments, not of metal.
non-metallic pipe used in hot and cold water distribution irrigation, drainage, venting, waste handling, corrosive waste handling, vacuum, water purification, chemical handling and dust collection