| 摘要 |
An overcap is provided for fitting over a top end of a container of the type having a top end closure including an inner rim defining an opening for access to the inside of the container. The overcap includes a body portion having an outer peripheral flange for attachment to the top end closure. The overcap further includes a downwardly depending flange adapted to engage the inner rim of the top end closure with a friction fit. The downwardly depending flange includes a vent that is active during engagement of the flange with the inner rim, prior to forming the friction fit between the flange and the rim.
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