components manufactured of cast or wrought metal, namely, tubing, elbows, tees, Y-fittings, union couplings, couplings, caps, adapters, air chambers, bushings, reducers, venturis, branch connectors, bulkhead fittings, crosses, cross-overs, eccentric couplings, expansion joints, return bends, flanges, tees, and elbows, floor flanges, pipe hangers

plumbing, heating and ventilation parts and fittings, namely, tubing, elbows, tees, Y-fittings, union couplings, couplings, caps, adapters, air chambers, bushings, reducers, traps, venturis, branch connectors, bulkhead fittings, crosses, crossovers, eccentric couplings, expansion joints, drains, flanged sink ells, return bends, flanged fittings, tees and elbows, closet flanges, floor flanges, connectors and adapters for soil pipe, closet elbows, pipe hangers, stack and drains all fabricated from copper, wrought copper or cast brass or bronze or fabricated of a molded, cast or extruded plastic; also valves, including gate valves, faucets, sillcocks, boiler drains, globe, ball, angle and U-valves, stop and waste valves, check valves, butterfly valves, manufactured of cast brass, bronze or iron for use in heating, plumbing and ventilation systems and installations; and irrigation systems and parts therefor, namely, perforate and imperforate tubing, tubing fittings, clamping rings, valves, pressure regulators, filters, injectors, water distributing sprayers and spinners, and proportional feeders; and irrigation systems and parts therefor, namely, perforate and imperforate tubing, tubing fittings, clamping rings, valves, pressure regulators, filters, injectors, water distributing sprayers and spinners, and proportional feeders