| 摘要 |
A cap for a liquid container is provided with the cap having a sidewall, an upper surface, an aperture sidewall, and an insert. The aperture sidewall includes an interior surface and a bottom. the insert has a sidewall portion and a bottom portion. The insert is adapted to be displaceable axially along the interior surface of the aperture sidewall in a first and a second direction. It is adapted when displaced axially in the first direction to cooperatively engage with the aperture sidewall so as to form a fluid-tight seal. The insert is adapted when displaced axially in the second direction to permit the passage of liquid through the aperture. The cap is adapted to be retained in fluid-tight sealing relationship with a liquid container by a screw-thread.
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