That's the overflow line telling you your fresh water tank is full so you should turn off the water or switch your tank selector valve before you flood the campsite.
If your coach is lower on the roadside the water may overflow through the vent hole on your gravity fill cap.
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2005 Monaco Knight 40PLQ; Cummins 8.3L ISC330, Pacbrake, Allison 3000, Roadmaster RR8R, ScanGauge D, 2004 Kawasaki Vulcan VN750(Geezer Glide) on a Versahaul carrier pulling a 2013 Kia Soul+; 2.0L, 6 speed Sport shifter(great car) on an American Car Dolly(great dolly.)
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