| 摘要 |
A cap assembly is provided having a top wall with a first aperture and a second aperture formed therein, a wall member which extends upwardly from at least a portion of the top wall, and first and second closing members both of which are selectively adjustable to a first and a second position. The first closing member comprises a base portion having a channel formed therethrough. When the first closing member is adjusted to its first position it forms a seal across the first aperture. Meanwhile, when the base portion is adjusted to its second position, the channel cooperates with the first aperture to form a passage through the cap. The second closing member also comprises a first portion and a second portion. When the second portion of the second closing member is adjusted to its first position, it forms a seal across the second aperture.
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