Originally Posted by
cyclebycle13
The cap threads on valve stem. I belive the threaded shafts are the ones that are threaded all the way down to the base of the tube.
Some tubes have removable valve cores as well. Many pump head seals can be destroyed by those threaded stems.
Understood.. what I'm saying is that I didn't think pump heads' gaskets/seals attach any further down the shaft than the threads that are already there to hold the caps anyway. So the threads that go all the way down would be irrelevant anyway.