17 Plastic tubes and pipe systems consisting, namely, of non-metallic flexible hoses and pipes for use in the convoluted tubing industry, insulated pipe supports, insulation jackets for industrial pipes, non-metal pipe couplings and joints, non-metal pipe collars, non-metal tubing and tubing couplings for joining and terminating pipes, pipe gaskets, joint packing for non-metallic flexible pipes, junctions not of metal for non-metallic flexible pipes; plastic tube fittings, namely, unions, reducers, tees, male connectors, caps and plugs for automotive, telecommunications, appliances, swimming pools, medical, marine, electrical conduit and fittings, robotics cable protection systems, mass transit, and custom use, namely, for manufacturing of corrugating equipment and tooling; plastic tube tie-ups, namely, unions, reducers, tees, male connectors, caps and plugs for automotive, telecommunications, appliances, swimming pools, medical, marine, electrical conduit and fittings, robotics cable protection systems, mass transit, and custom use, namely, for manufacturing of corrugating equipment and tooling; non-metal gaskets for automotive, telecommunications, appliances, swimming pools, medical, marine, electrical conduit and fittings, robotics cable protection systems, mass transit, and custom use, namely, for manufacturing of corrugating equipment and tooling; non-metal couplings for use with sewer systems