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Hi Adam,
I believe unless you use a very unusual seal system
you will have difficulty holding pressure cannister. Most seals are lipped seals
and can only hold significant pressure from one direction.
You could use two seals with one facing each way to
accomplish your goal. I am going to use a standard seal arrangement and usi a
first stage scuba regulator to maintain a similar pressure inside with
relationship to whats outside.
I have not built mine yet, so I am sure others have
more specific info and possibly ideas.
Best Regards,
Jim Kocourek
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