Plumbing and steam-fitting supplies-namely, cooks, jets, metal pipes, pipe fittings, nozzles, fluid control valves, tubes for use in distilling and concentrating apparatus, ejectors, floor drains, fume ducts, sinks, sink strainers, and traps; castings of ferrous alloys and wrought sheets and bars of such alloys,

Batteries and parts thereof, electro-plating and electrolytic equipment including electrodes, and electrical heat exchangers, all such parts being intended to be used in contact with corrosive liquids or in corrisive atmosphere,