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Old 09-14-2019, 09:17 AM   #16
City: Rochester, NY
Country: USA
Vessel Name: Hour Glass
Vessel Model: Chris Craft Catalina 381
Join Date: Aug 2019
Posts: 796
I have a similar design issue with my aft head where it's fairly far away from the holding tank and not a lot higher than it. IMO, if you have to go up a bit, do it as close to the toilet as possible to make it easier to keep the non-draining part of the line full of clean water. And then all downhill from there.

For the Y-valve, if you have the ability to dump the tank overboard, I'd ditch the Y-valve for simplicity. Less connections, less hose and in theory it should let you eliminate a thru hull.
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