| 摘要 |
The plug assembly comprises a sleeve 10 open at one end and having wall 14 at the other end being adapted to be inserted closed end first into the opening to be sealed, the closed end of the sleeve protruding beyond the wall inside face, an elongate sealing member 12 having a stem 17 and an enlarged head 18, the head being located substantially at the closed end of the sleeve 10 and the stem extending beyond the open end of the sleeve, the inner surface of the sleeve being adapted to encapsulate at least the head of the sealing member within the sleeve such that during the sealing operation the entire sealing member 12 can be withdrawn from the sleeve 10 to leave the sleeve in sealing contact with the opening and the inside of the sleeve cylinder substantially free from any obstruction. |
