11 Plastic plumbing fittings, namely, couplings, caps, bushings, adapters, elbows, tees, valves, nipples, extenders, plugs, saddles, nuts, floor strainers, boiler drains, bibbs, sillcocks, water hammer mufflers, wyes, expansion joints, drains, p-traps, u-bends, closet flanges, and reducing assemblies