I humbly suggest considering a composting system to get rid of all those stinky hoses, tanks
, and valves. But, if that is not what you want to do I suggest plumbing
the toilet direct to the holding tank, which can then be evacuated be either of two routes: most often through a deck
fitting, and secondly through a pump and overboard
. Keep the through hull
handle padlocked closed and you are all set for CG and other inspections. I also think ideally you avoid having a Y valve--instead have two evacuation hoses connected to the tank--one for the deck
pumpout and one for the onboard pumpout. Y valves are problematic.