K2 wrote:
Why would I lower the vented
loop down by the thru hull, necessitating the requirement to sail with
the thru hull closed?

I didn't suggest lowering the vented loop, only moving it to the other
side of the y-valve to allow it to serve the tank discharge line too.

I simply believe that injecting the macerator
discharge into a "T" between the head and vented loop (with a ball
valve between the "T" and toilet to prevent backflow into the head
when operating the macerator) would be a much easier endeavor than
anything else.

That puts the tank discharge awfully close to the toilet bowl...closer
than I'd want to risk the ball valve being left in the wrong position
when the tank is dumped. 'Cuz a macerator moves 12 gals/minute, enough
to make a very big mess very quickly. How hard can it be to simply swap
out the y-valve and vented loop? The lines are already in place. Then
all you have to do is tee the line from the macerator into the line
between 'em. Which would eliminate the need for any ball valve.

But it's your boat...


--
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://shop.sailboatowners.com/books...ku=90&cat=1304