cork is the insert of schrader valve

well, those names are commonly used referring to the same thing on a tire:

valve, valve stem, schrader valve...  the insert of the valve needs to be relatively tight so to make it air tight but not too tight.  using a special tool in the shape of small fork to adjust it.   here is how it looks like:

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• 学习了。谢谢。不懂车，下次还得四处问，找人解决。 -snowlover2011- ♀ (0 bytes) () 12/29/2011 postreply 16:46:34