TB wrote:
I checked the ronco site and they have a tank the size I need but they
do not appear to have the option of a top discharge, that is with an
internal pipe from a top fitting to the bottom of the tank. I don't like
the idea of a bottom discharge.

They'll install any fittings you specify, in any location you specify,
including a discharge on the top with a pickup tube inside to the bottom.

If the tank is going in a sailboat, I recommend that you put ALL the
fittings ON the top, with both the vent and the inlet from the toilet
away from the hull, toward the centerline of the boat. That will prevent
waste in the tank from flowing into the vent line and the head discharge
hose when you're heeled, no matter which tack you're on.

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