11 Installations for heating and refrigerating; solar installations for heating; apparatus for heating for solid, liquid, or gaseous fuels; water heaters; heating boilers; air conditioning installations; water conduits installations, namely, plumbing fittings in the nature of flexible connecting pipes and flexible connecting pipelines; drinking water heating installations; heat pumps; heat accumulators; accumulators being parts of heating and water supply installations, namely, steam accumulators, hot water tanks in the nature of expansion vessels, storage vessels, buffer storages; apparatus for heating, refrigerating, water supply and sanitary purposes, namely, multiway mixer valves for water pipes, filters and water circulating pumps sold in combination; hot water expansion tanks for central heating installations; pressure water tanks; filters as parts of household or industrial installations, namely, water filtering apparatus; pipe line cocks, namely, spigots; flexible pipes being parts of sanitary installations; mixer taps for water pipes; regulating accessories for water apparatus and pipes; solar thermal collectors for heating; thermostatic valves as parts of heating installations; heat exchangers, not parts of machines; sanitary installations and equipment in the nature of steam rooms, sinks, showers, bathtubs, toilets; regulating accessories and safety accessories for water installations, namely, pressure regulators; taps; plumbing fittings, namely, backflow preventers; gas water heater for bathtub consisting of circulation pumps with thermostat to fill, re-heat water and keep water warm; flushing devices for drinking water and other fittings of metal, for heating, refrigerating, drinking water and solar installations, namely, bibbs, cocks, traps; individual parts and fittings for the aforesaid goods, included in this class, namely, stopcocks; plumbing fittings, namely, valves, ball valves, slide valves, gate valves, check valves, isolating valves