6 Gas and liquid piping and pipeline components made predominantly of metal, namely, sleeves, shutters, sleeve shutters, straps, shackles, caps, flanges, pipes, pipe fittings, pipe clips, pipe collars, pipe connectors, pipe couplings and joints, junctions for pipes, pipe muffs, manually operated valves, sealing rings, gasket rings, ball lock pins, caps for pipes and pipe ends, closures for pipes and pipe ends, lids, plugs, seals, manhole covers, pipe safety fittings that minimize traction, dirt, and rotation, hand wheels, non-electric position indicators being parts of pipe valves, dummy covers, insertion pipes, nipples, gasket rings; metal shaft covers, metal height-adjustable and metal levellable shaft covers and their metal base components and frames, metal brackets, and metal saddles for use in the construction, assembly and installation of piping