| 摘要 |
A manual air pump for two wheel tires comprises means forming a pressure chamber, a head part, a first connecting element for connecting with a bicycle valve and a second connecting element for connecting with an air pin of a motorcycle valve, the head having a connecting passage which connects the first connecting element with the second connecting element and communicates with the pressure chamber, and a closing body arranged movably in the connecting passage so that under the action of its own weight it can close the first connecting element or the second connecting element in one of two different positions of the head.
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