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Old 03-03-2015, 07:53 AM   #6
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Join Date: Oct 2007
Posts: 19,849
"My aft head back-fills when the holding tank is full and the sea is rough."

A vented loop will do nothing for an overfilled tank flowing down hill into the toilet.

Replace the duck bill and the bowl will stay empty , but not for long.

I would rather work out an underway dump procedure for the full tank .
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