Steve wrote:
Speaking of vents::
However, speaking of combine vent:: I did end up with a problem of cross
over between my holding tank and my gray water tank. They share the same
vent and even though they are tee'd to gather about 3 ft above the tanks,
when ever the holding tank is full (I don't have gage) the liquid flows over
into the gray water tank. Eventually I will discover the problem when the
gray water backs up into the ice box drain. YuK.

You're gonna have worse problems than that, Steve. Waste contains animal
fats and other stuff that's building up in your vent. It's prob'ly
already reduced the diameter at the tank fitting and tee considerably,
and will completely block the vent. But you won't know it till both your
waste and gray water tanks either become pressurized or you can't dump
'em at sea because of the vacuum...or worse yet, a strong pumpout cracks
one or both 'em.

I'm surprised you can tolerate the odor that has to come out the vent
each time the head is flushed or anything goes down a drain.

Peggie
----------
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://www.seaworthy.com/html/get_ri...oat_odors.html