Hmmm, that is true. But the rear bags were set up the same way. Did the design assume that no air ever got into the system?
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The factory Gravity III ballast system installed in Moomba boats from 2002-2008 did not include a vent connection. You had to loosen the top plug to burp the air out of the bag. Wakemakers sells a vent upgrade kit for these years.
http://www.wakemakers.com/supra-moom...grade-kit.html