whirlpool baths and whirlpool bath installations, namely, whirlpool baths in combination with tubing, air and water conduits, air and water valves, air and water controls, jet nozzles, and pumps all sold as a unit; spa baths and spa bath installations, namely, spa baths in combination with tubing, air and water conduits, air and water valves, air and water controls, jet nozzles, and pumps all sold as a unit; hydrotherapy baths and hydrotherapy bath installations, namely, hydrotherapy baths in combination with tubing, air and water conduits, air and water valves, air and water controls, jet nozzles, and pumps all sold as a unit; apparatus and appliances for mixing air and water, namely, jet nozzles, pumps, venturi and venturi controls, temperature controls, air controls, air valves, water controls and water valves, all for the aforesaid baths and installations; and parts and fittings, namely, jet outlets, jet covers, suction outlets, suction covers, waste outlets, waste covers, overflow outlets and overflow covers, and timers, all for the aforesaid baths and installations