22" max! I would not go over that. Most regulators on aspirator pumps have gauges that go beyond that but will max out right around 22" give or take a few "s.
Thanks ... I'm in the A/C field and have a 6cfm unit in the garage and I know what a 500 micron vacuum will do. It would actually boil off all the wine if it didn't implode the carboy.
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