RE: [PSUBS-MAILIST] Which Through-Hull?

["Mad Pirate Shin" <psub_only_temporary@hotmail.com>]

  Mechanical, electrical, pneumatic, that's what I want to know.  What are 
the advantages of each?  Which types would be the most reliable/safest at 
700 feet down?
  Electrical through hulls seem to be the easiest to maintain, so if they 
can be made to withstand the depths I'd like to operate at, I would 
considering making all my through-hulls electrical.  However, how does the 
sealing material hold up over time?  Is it easily replaced?  If not, o-rings 
might be easier to maintain.
  What I want are opinions as to the ease of maintenance and reliability of 
the different types of though-hulls which will operate at the wanted depth.

          not wanting to poke holes in his boat,
                           Shin

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