Keith wrote:
Why not just add a second vent line?

From her description of the installation and current vent path, I don't
think a second line would accomplish any more than one relocated to a
new forward through-hull. Adding a second vent line would still require
a new thru-hull, but moving the existing one eliminates the need for a
new fitting in the tank.

--
Peggie
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Peggie Hall
Specializing in marine sanitation since 1987
Author "Get Rid of Boat Odors - A Guide To Marine Sanitation Systems and
Other Sources of Aggravation and Odor"
http://69.20.93.241/store/customer/p...40&cat=&page=1