Rectangular Plastic Tube Expansion Inserts or Plastic Rectangular Expansion Tube Inserts, Plastic Expansion Inserts for Rectangular Tube, Expanding Tube Inserts, Tubular Expanders and Expandable Sockets with the Expansion mechanism being driven by the Nut. Simply screw into these Bungs with a standard metric thread and the screwing motion will expand the insert outwards, thus gripping the Tube from the Inside and the dimensions listed are exactly as you would buy the tube, so it's outside dims x wall thickness.
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