17 Extruded plastic articles in the form of pipes, plates, rods, molded parts, and fittings for general industrial use; molded plastic parts for industrial use, namely, seals, gaskets, bushings, valves, washers, brake liners, suction and brake cups, diaphragms, balls, hoses, sleeves, stoppers, grommets, u-cups, poppets, bellow, and impellers