I installed one of these on the vent hose which is easily seen and accessible in my fresh tank and water pump compartment.
I fill up my fresh water tank until it starts to overflow out. Give it a minute or two to settle, and if itís still running out, shut off the tap.
By the time we get to a point for dry camping, itís part of my set up routine to open the valve and we have access to the maximum capacity of the fresh water tank.
Ken and Terry
2018 Sunseeker 2430S
and only rarely pushed by our 2017 GMC Terrain toad (4 wheels down)
Former Georgetown 330TS owner for 10 years with more mods than I can count.