| 摘要 |
An apparatus and a method for removing air from a collapsible plastic structure having known characteristics of flexibility and curvature. The apparatus is a hollow cylindrical plastic tubing having interior and exterior surfaces, the interior surface defining a flow path for a fluid. The exterior surface of the tubing is formed to have a selected number of ridges defining valleys there between, the ridges extending for a selected length of tubing. A plurality of perforations are formed in the valleys, and extended a selected length of tubing for providing a plurality of additional flow paths to the interior of the tubing.
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