| 摘要 |
A cap has a cover member, a pump member and a spring. The pump member releasably and sealingly engages a mouth of a container. The pump member has a first valve for communicating with an interior space of the container. The cover member slidably and sealingly engages the pump member defining a cavity therebetween. The cover member has a second valve. The spring is mounted between the cover member and the pump member for urging the cover member away from the pump member. Reciprocating movement between the cover member relative to the pump member urges fluid from within the cavity through one of the first and second valves on a first stroke and urges fluid into the cavity through the other of the first and second valves on an opposite stroke.
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