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					Originally Posted by manaf  its leaking from the bottom of the tank onto the sump the output is not in a over flow, runs through a one way valve so water can only go out , 
 so tightening it might be hard to reach from where the sump is would have to try doing in through the tank??
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 Could you take a pic?  This sounds odd.  I can't imagine a bulkhead positioned so it could be tightened fro inside the tank.  It 
should require tightening from the outside of the tank, but your setup sounds uncommon.