Quote Originally Posted by KnoxMojo View Post
The only way to do this would be to install an inline ball valve to close off the bow bag from the hard tank. It would be something you'd have to manually open and close.
Problem with that is if you had a valve between the two and you closed it to drain the center tank there would be no way for air to enter the tank to take the place of the water you are removing. This will result in a cracked and busted tank


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