Tank flush

[Woody62]

After last year of camping, I had my 2021 Sunset 24bh winterize at a dealership. This year I dewinterize it and went camping through out the summer. I decided to use the tank flush for the first time and notice water filling up my sealed under belly. My question is....Would this been winterize when they did the service. Water was still flowing into the tank but like I mention before, leaking into the under belly. As you know, this is a separate line so not sure if they would have winterize it. Thanks Ian

[mark5w]

Not sure how they winterized yours or how you did it but I blow out both the city water line and the tank flush line to make sure there is no water in them.

[Woody62]

Thanks for the reply...They winterize with antifreeze

[Wingerdinger]

Since it's a totally separate area and fitting, anybody winterizing would have had to blow the flush line separately. It's very possible that they missed it, I've done it myself.
That said, most of the time the black flush check valve is accessible. Mine is under the bathroom sink, way up high. Follow the natural path from the hoes fitting to the cabinetry inside, I bet you'll find it, and your problem. They are known to be troublesome. Mine came apart.
I haven't done it on this camper, but my last one I replaced with a brass check valve.

[Papa-T]

I blow mine out also when winterizing.

[Yakherder]

I've never thought of blowing out the flush line. For winterizing, I crawl under the bathroom sink and take off the back water check valve and drain the water. I reinstall it in the Spring and haven't had a problem, yet. But, I can see where blowing out this line may save me a lot of trouble plus it may blow off the crap on the sprinkler heads inside the tank.