First off there is NO overflow on waste tanks ....it's WASTE and should be dumped according to local laws/restrictions
Grey could backup into shower
(Black could backup into toilet piping or even Vent line)
Only 'overflow' could happen if tanks were overfilled and they leaked into your underbelly
I ONLY use the fresh water tank/pump
Both are enclosed/heated etc ....I never leave a faucet dripping
IF CG wants there supply bibb dripping that's on them --- so just disconnect your hose, Drain it, Stow it and crack their bibb just enough to drip
Is it time for your medication or mine?
2007 DODGE 3500 QC SRW 5.9L CTD In-Bed 'quiet gen'
2007 HitchHiker II 32.5 UKTG 2000W Xantex Inverter
US NAVY------USS Decatur DDG31