I'm not aware of one. Some time ago I created a plumbing schematic for a 2015, but so much has changed over the years it's becoming increasingly irrelevant. (However, you might still find the collection of resources in the linked discussion helpful.)
If you (or any other artists out there) want to take up the cause, feel free! :-)
Comments
Compared to earlier year Tab 320's the new ones have:
-+- Fancy Sink P-Trap
-+- Cassette Toilet / tank
-+- Nautilus P2.x Water Control Valves
The Nautilus P2.x is very simple compared to the one installed in the Tab 400.
I created a simple / basic / preliminary overview of the Plumbing and Nautilus water flow. Would the document be of use?
See attached PDF document.
TV: '17 Colorado V6 Z71 4x4, Tow Package, GM Brake Controller
Adventures: 54 Nights: 341 Towing Miles 43,780
TV: '17 Colorado V6 Z71 4x4, Tow Package, GM Brake Controller
Adventures: 54 Nights: 341 Towing Miles 43,780