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 Frank, 
            
You might want to run the air and vent seperately,  I seem to remember a 
description of somebody's assent where the expanding air nessesitated playing 
around with venting and injecting air controls,  with your system it might 
be a little more difficult. 
  
Brian 
  
  Hi. Here's a rough sketch of the plumbing for blowing ballast on my sub. 
  I plan on using stainless nipples as thru-hulls, with 1/2 inch valves directly 
  on the nipples, and a 3/8 air line tapped in to a ''T'' to blow the 
  tanks/lines. This is pretty rough, but it gives you the basic idea. Any 
  comments?  Frank D. 
    
  
 
  
   
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