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Regarding the diaphragm with the extra big hole, it may have been
for an “under-pressure” valve, as explained by the article I just
stumbled upon in my files.
Buc I read the article link you posted. I just had an experience with that subject. I recently purchased some garden tractor tires at an auction. That was on one of those days when it was warm out. The tires were in storage some where, they were new on new wheels but they were mostly flat. I piled them in my pole barn and forgot about them. I probably won’t do anything with them until summer. I recently walked by them and the tread was sucked in like a vacuum was sucking them inside out. Temperature was a balmy 10 degrees outside. Wonder if the change in temperature will crush my tanks. I keep the caps tight to keep the condensation out. Might have to re think that!
interesting for sure! dale