11 Structural plumbing parts, namely, fittings in the nature of ball valves, water hammer arresters, and rapid adjust trip flush levers; structural sink and bath parts, namely, overflow plates in the nature of sink and bath overflows and sink strainers; structural plumbing fittings in the nature of toilet parts, namely, dual flush toilet valves, toilet flappers in the nature of valve seals specially adapted for toilet tanks, toilet fill valves; toilet fixtures and fittings for sealing the closet flange position between a toilet and the floor, namely, non-metal sealing rings specially adapted for toilets; water filtration units and water softener units comprised of water purification tanks, sediment pre-filters, and copper-zinc, mineral stone and activated carbon filters; non-metal plumbing fittings, namely, air valves for drain pipes, waste pipes and vent pipes; tub parts, namely, non-metal tub overflows for pipe leakage; plumbing fittings, namely, floor drains, roof drains, area drains, deck drains, clean out drains and shower drains made of metal or plastic for use in industrial, commercial and residential buildings