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Hi Alec. I like that idea of a back-up collar that slides into place ( if I
understand it correctly.)
In fact, I like the idea of back-up and redundancy in general. I'm sure
you'll get that thing sealed up, and with the brains of this group helping, will
no doubt have a good solution that others could use too. This is one of those
areas that I think most guys building a sub ponder a long time.
I've seen the basic "packing" type fittings that George used on his boats,
and it seems like that alone would prevent most of the water flow, but with the
two additional designs you've described, I'd feel secure in diving with you.
Good luck on this, it sounds important to all of us. Frank
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