Originally Posted by Ron in BC
My 2014-19 has the same hose for the grey tank. So it's use isn't totally new.
Same here for my 2017 21. Its also either has a leak in the run through the closet, or the opening at the top isn't completely sealed. I've had two occasions where dumping a gallon or to from the shower floor or sink will make the closet (and in the worst case, the entire trailer stink. A dose of gray or black tank additive eventually solves the problem.
Now that I'm home, I probably should crawl up on the roof & check it out...