Attached is a picture that shows what I'm talking about.
The frame mount valve is the tank drain, the large hose with the rubber on it is what seems to be the overflow.
The white fresh water hose, haven't been able to get anything to come out of that one yet. Can't figure out what it's for......
2016 Jayco Eagle HT 29.5BHDS (ordered 12/30/15, delivered 3/8/16)
2015 F-350 crew cab, short bed, 6.7L PSD, Pullrite Superglide 3300 hitch