That kinda makes sense. I looked it up in the search and on another forum. It looks like it would work, the only thing people said was that for it to work well both tanks have to be the same level, not level as in fullness but level as in same height off the ground. I think I am going to try this because my shower tank fills up way before my galley tank. My gray tanks share the same output (dump pipe) so in theory I should just be able to shut the dump pipe and then open both gray valves and they should equalize.
Thanks for the idea and making me think about it!
2015 Forest River EVO 2850
2012 Dodge Ram 2500 6.7 Cummins
Yamaha 2k x 2 with parallel cable
EMS 30 PI portable w/ Edison plug
Nights Camped (2016-13) (2015-13)