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The viewport design that I'm using has a
champor all the way around the edge of the acrylic where an O ring sits.
Then the retaining ring goes on top of that which puts pressure on the O ring
and basically holds the acrylic in place. The O ring makes the seal and
then you also have the flat viewport seating against the viewport flange with
some sort of gasket inbetween the acrylic and the steel flange. I think
there is a picture of this on the psubs site.
Brian
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