11 plumbing, heating and ventilation parts and fittings, namely, elbows, tees, Y-fittings, union couplings, couplings, caps, adapters, branch connectors, bulkhead fittings, eccentric couplings, return bends, flanged fittings, tees and elbows, closet flanges, floor flanges, connectors and adapters for soil pipe, closet elbows, wrought copper