I usually flip the fill valve and then go back and open the door and remove the hose fill cap. In just the minute or less that it takes to do that there will be a release of air pressure when I take the cap off leading me to believe that the overflow tube isn't even big enough to release the air pressure when using the fill valve let alone the water when it's full.
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Dick, Joyce, Diego, Picatso and Gustav
2017 3720 RL, and 2013 HC 343RL
Pullrite Hitch, IS, Disk Brakes, 3rd AC, Winegard Traveler, Bathroom door mod, Dometic 320, couch for desk swap, replaced chairs, sun screens, added awnings, etc.
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