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Old 01-01-2012, 06:07 PM   #10
HeadMistress
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City: AR
Join Date: Jul 2009
Posts: 2,515
RE: Back flush vent line

Oh yuk!

Tracing vent lines to their thru-hulls really isn't that hard to do...'cuz there aren't very many--holding, fuel and water.

As for any concerns about backflushing the line leaving water sitting in a low spot, the solution to that one is simple: eliminate the low spot. 'Cuz backflushed water isn't the only thing that can leave water pooled in it...'condensation...spillage from an over-full tank are just two that come to mind. You can't back flush the vent if there's a filter in the line (which IMO is one of the reasons to get rid of the filter!). However, insuring that it never becomes blocked is essential preventive maintenance...and the easiest way to do that is to back flush it every time you wash the boat and/or pump out the tank. Some vent thru-hulls make it impossible...but there's a simple solution to that too: replace the "vent" thru-hull with an open bulkhead thru-hull...which will also help to keep the tank aerobic by allowing more air exhange.
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