Black tank flush intake leak

[Seaton]

We have a Jayco-Whitehawk 2018 23MRB. When I am using the black tank flush feature I have water coming from behind/under the bathroom sink, which is immediately behind the flush tank intake. Anyone have this occur? Was it the valve, the connection, or overflow? I cannot visualize the connection from inside the trailer.

Thanks

[smoothy]

I did on my 2018 28BHS. There was a back flow valve that appeared to be mounted upside down as it stated this side up or something like that. Not sure if that made a differnence as I also hand tightened the collars on the valve etc. I also cut back on the pressure going in. It seems to be OK now.

[Marcm157]

The backflow valves are notorious for failing and often times they are in a very inaccessible position. Most likely this is the cause of your leak.