Sanitary apparatus and installations, namely, bathtubs, bidets, hot tubs, hot water heaters, hot water tanks, kitchen sinks, lavatories, lavatory bowls, lavatory seats, portable toilets, portable urinals for outdoor activities, showers, sinks, sitz baths, toilet bowls, toilet seats, toilet tanks, toilets, urinals, water closets, whirlpool baths, whirlpools; pipes being parts of sanitary facilities; parts of sanitary installations, namely, wash-hand basins; bathtubs; plumbing fittings, namely, traps for sanitary installations; manually operated air admittance valves for use in ventilating plumbing and sewer systems; decompression devices for drainage systems, namely, decompression valves for absorbing air pressure peaks in plumbing and sewer systems; plumbing fittings being component parts for the aforementioned goods, namely, in the nature of plastic adaptors and couplers for coupling the aforementioned goods