Originally Posted by RMoore
Would it work if the diverted valve was located at the same height as the top of the holding tank? Or do I rely on gravity and have to locate the diverted valve at the lowest possible location.
Here's a fact that will inform my own holding tank re-design: My previous boat came from the factory with the macerator mounted on the top of the tank, with a "T" off the hose that went to the deck fitting. No "Y" valve. This arrangement worked great for 10 years, pumping overboard when off shore and using pump-out facilities dockside.
I like this arrangement because it minimizes the number of fittings below the "waterline" of the holding tank. Murphy's law dictates that any failures in the waste plumbing will invariably occur when the tank is full. It's bad enough working on those hoses when empty.