METALLIC PIPES FOR THE TRANSPORT OF PRESSURIZED AIR, GASES AND FLUIDS; METALLIC FITTINGS FOR PIPES; METALLIC VALVES FOR METALLIC PIPES; METALLIC REDUCERS BEING METALLIC FITTINGS FOR PIPES; METALLIC CAM NIPPLES BEING METALLIC FITTINGS FOR PIPES; MANIFOLDS OF METAL FOR PIPELINES; METALLIC PLUGS; METALLIC FAST COUPLERS BEING METALLIC FITTINGS FOR PIPES; METALLIC COLLARS FOR FIXING PIPES; METALLIC BOLTS; METALLIC THREADED RODS; STAINLESS STEEL CLAMP RINGS BEING METALLIC FITTINGS FOR PIPES; METALL...