Aluminum alloys; Branching tubes of metal for pipelines; Clevis fasteners of metal; Corrosion-resistant metal overlays and alloys for fittings, steel plates, flanges, piping components; Fittings of metal for compressed air hoses; Fittings of metal for flexible pipes; Fittings of metal for pipes; Industrial metal hoses; Junctions of metal for pipes; Manually operated metal valves; Metal elbows for pipes; Metal lids; Metal nipples; Metal pipe clips; Metal pipe connectors; Metal pipe couplings a...