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6
Common metals and their alloys; metal building materials; transportable buildings of metal; materials of metal for railway tracks; non-electric cables and wires of common metal; ironmongery, small items of metal hardware; pipes and tubes of metal; safes; goods of common metal not included in other classes; ores.
metal pipe fittings consisting of couplings, joints, connectors, unions, adapters, and mechanical valves other than parts of machines; manually operated metal valves for fluid conduits and fluid systems; metal tubing, metal elbows for pipes, metal tees for pipes, metal wye-fittings for pipes, metal caps for pipes, and metal reducers for pipes
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11
Apparatus for lighting, heating, steam generating, cooking, refrigerating, drying, ventilating, water supply and sanitary purposes.
plumbing fittings, namely, tees, unions, couplings, pipe thread adapters and elbows
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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-metal pipe system components, namely, non-metal fittings for pipes, non-metal spacers for non-metal pipe fittings, flexible plastic pipes for plumbing purposes, plastic elbows for pipes, plastic pipe tees, plastic wye-fittings for pipes, plastic union couplings for pipes, plastic pipe couplings, plastic pipe caps, plastic pipe adapters, non-metal bushings for pipes, plastic reducers for pipes, plastic cross fittings for pipes, plastic crossover fittings for pipes, plastic eccentric couplings for pipes, plastic return bends for pipes, non-metal flanged fittings for pipes, plastic floor flanges for pipes, flexible plastic nipples for pipes, and plastic cutoff nipples for pipes