I just ran across another reference on the topic during the "big" snow
storm yesterday.  Try the magazine "Popular Mechanics" back issue topic
index.  They have run several articles on the topic of building your own
wet/dry sub which included references to manufacturers of commercial
units.  I don't know specifically which issues apply but ran across
references in a bibliography listing.
   Another place to give a call might be Woods Hole Oceanagrphic Tech
School.  They have on file graduate thesii on the topic.  They also may
have the current listing for the companies in question as they do
purchase some of their units from outside suppliers.
     Be wet and well.
Dennis
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