| 摘要 |
An apparatus for sealing a hole in a wall (4), the wall in use dividing a region of relative high pressure from a region of relative low pressure, the apparatus comprising an elongate stem (2) connected at one end to a sealing member (3) which extends substantially radially from the major axis of said stem in an extended state such that, in use, said relative high pressure acts to seal the sealing member in the extended state against the wall, wherein said sealing member is resiliently deformable from said extended state into a collapsed state in which the sealing member is folded towards the stem, and into an everted state in which the sealing means is folded away from the stem. Said sealing member may when in its extended state form a dome shape which acts to maintain an air gap around the hole. |
