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PLASTIC AND/OR METAL TUBING COMPOSED OF A SINGLE TUBE OR PLURALITY OF TUBES ENCASED OR HOUSED IN A PLASTIC OR METAL SHEATH FOR THE TRANSMISSION OF FLUIDS, WIRE, CABLE, TUBE FITTINGS, JUNCTION AND UNION BOXES, GROMMETS, TUBE RACKS, SPLICING CONNECTORS, TERMINAL BLOCKS AND CABLE CLAMPS