Apparatus for water supply and sanitary purposes, namely, bathtubs, bidets, faucets, sinks, showers, toilets, shower heads, toilet seats, and structural parts for the foregoing; bathroom plumbing fittings and fixtures, namely, faucets, taps, bibbs, cocks, valves, lift rods, pipes being parts of sanitary facilities; and compression plumbing fittings, namely, couplers and collars