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Old 02-18-2013
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Re: Head Backfill

According to Peggy Hall "Headmistress":

Quote:
This means that TWO vented loops are required in the discharge--one between the toilet and the the treatment unit and a second one between the treatment unit and the thru-hull. Both loops need be high enough to be at least 6-8" above waterline AT ANY ANGLE OF HEEL...if you put 'em too low, they won't solve the problem.
Not clear from the OPs description of this is what he has exactly....
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