Doug Dotson wrote:
Not sure how grease etc is going to leap out of the galley sink into
the vent

Prob'ly won't if you never fill the sink to wash dishes or allow any
dirty dishwater to go down the drain.

Our tanks are vented into the head sinks via a spout in
each. Easy to see when the tanks are full when filling...

As long as you're in the head while they're filling... or there's no
plug in the sink if you aren't.

I think the vent should go out the hull. But hey...they're YOUR boats,
so whatever floats 'em for YOU is fine with me.

--
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