bushman wrote:

OK plumbing everything to the top of the tank will again reduce
gallons but will get the inlet closer to level with the head.

You'll need a vented loop in the discharge line that's at least 6-8"
above the waterline at any angle of heel, so whether the head is level
with the tank is irrelevant.

The Y
valves I pulled out were less than two years old and almost unusable.
Bosworth Sea-Lect Diverter Valves $65 very hard to turn and the body
torqued. Hardly any crud in them. I want a rock solid system
contained on top of the tank.

Not sure what you mean by "contained on top of the tank..."

Who makes the best Y-valve?

Whale...hands down.

--
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/store/custo...0&cat=6&page=1
http://shop.sailboatowners.com/detai...=400&group=327