| 摘要 |
A lid includes a flat portion having a first aperture and a second aperture formed therein, a hinge positioned about a center of the flat portion such that the first aperture is on one side of the hinge and the second aperture is on an opposite side of the hinge, a cover, having two directly opposing sidewalls each with a protrusion, rotatably attached to the flat portion via the hinge, a valve housing integrally formed with the flat portion, a valve, and a valve retainer for retaining the valve within the valve housing. The cover pivots relative to the flat portion so as to engage either the first aperture or the second aperture, and when the protrusion on one sidewall of the cover is pivoted towards the first aperture, the protrusion on the other sidewall simultaneously pivots away from the second aperture.
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