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Now I am intrigued. Don't mean to ask for a dissertation but a little more info would be appreciated. Do I not need the o-ring adjacent to it either? Thanks. Mark
It does not have to be in there. That was their version of an "automatic" reserve. The small hole does just what you would expect, making it hard to breathe at lower pressures. Ascending let you breathe easier, but descending just made it get worse again. There's no mistaking that you are running low on air, it just doesn't wait until the last minute to let you know. (I hope this wasn't too much of a "dissertation", but didn't know how to shortcut it)
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