CPC F16J 15/022 (2013.01) [F16J 15/028 (2013.01)] | 24 Claims |
1. A method of sealing an access to a thermally insulated container containing a controlled gaseous composition, comprising:
providing a hyperboloid polymeric tube which extends through a wall of the thermally insulated container, having granular insulated material positioned between the exterior of the polymeric tube and the adjacent portion of the wall;
providing at least one item extending through the bore of the tube; and
twisting the tube in a first direction to cause it to constrict around the item and provide a seal around the item; and, optionally,
twisting the tube in the opposite direction to open the tube.
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