PIPES, PARTS OF PIPES AND VALVES OF CAST IRON, WROUGHT IRON, MALLEABLE IRON, BRASS, BRONZE, COPPER, NICKEL, AND STEEL-NAMELY, FABRICATED PIPE, COUPLINGS, UNIONS, NIPPLES, BUSHINGS, SOCKETS, PLUGS, FLANGES, CAPS, REDUCERS, RAILING FITTINGS, ELBOWS, T'S, CROSSES, Y BRANCHES, BENDS, NUTS, EXTENSIONS, PIPE FITTINGS FOR CONNECTING OR SUPPORTING PIPES, PLATES, HOOKS, LOOPS, PIPE HANGERS, VALVE SERVICE BOXES, HANDLES, VALVE OPERATING HAND WHEELS, BRACKETS, NOZZLES, RINGS, CLAMPS, SADDLES, CASING HEADS, WELL POINTS, ANGLE VALVES, GLOBE VALVES, CHECK VALVES, CROSS VALVES, GATE VALVES, RADIATOR VALVES, SAFETY VALVES, Y VALVES, REDUCING VALVES, REGULATING VALVES, FOOT VALVES, TANK VALVES, BLOW-OFF VALVES, HOSE VALVES, THROTTLE VALVES, ROCK DRILL VALVES, PLUG COCKS, LUBRICATED PLUG VALVES, AND BACK PRESSURE VALVES