6 METAL PIPE; METAL FLANGES, COUPLINGS, AND CONNECTORS FOR PIPES, TANKS, TUBES, CONDUITS AND CYLINDERS; METAL OUTLETS FOR PIPES, TANKS, TUBES, CONDUITS AND CYLINDERS, AND PARTS THEREOF; METAL UNIONS FOR PIPES, TANKS, TUBES, CONDUITS AND CYLINDERS; MANUALLY-OPERATED METAL VALVES; METAL GASKETS FOR PIPES, TANKS, TUBES, CONDUITS AND CYLINDERS; PLUGS OF METAL OTHER THAN PARTS OF MACHINES; METAL CAPS OTHER THAN PARTS OF MACHINES FOR PIPES, TANKS, TUBES, CONDUITS AND CYLINDERS; BUSHINGS OF METAL OTHER THAN PARTS OF MACHINES FOR PIPES, TANKS, TUBES, CONDUITS AND CYLINDERS; REDUCERS OF METAL OTHER THAN PARTS OF MACHINES FOR PIPES, TANKS, TUBES, CONDUITS AND CYLINDERS; REDUCER INSERTS OF METAL OTHER THAN PARTS OF MACHINES FOR PIPES, TANKS, TUBES, CONDUITS AND CYLINDERS