black tank flush check valve

[LMorganMNx]

Cate and Rob, thanks but the valve is not there. I agree it would make sense.
I took photos and even used an endoscopic camera. Up, down, sides, nothing but red and blue shower tubes. no black tubes, no valve.

[Cate&Rob]

LMorganMNx

By RVIA regs, the black tank flush vacuum break has to be above the rim of the toilet. This should be the “band of space” around the bathroom . . . there has to be access somewhere. Could it be behind the mirror/cabinet above the sink? (I am not familiar with your layout, so am just guessing)

Rob

[howson]

LMorganMNx -- an alternative way to figure out the valve's location: start at the black tank flush (water input) connection and follow the black soft hose. At some point it will go up--that's the feed to the valve's input. At the black tank itself will be another black soft hose attached to the sprayer. That is the output from the valve--follow that back, too, and it should be near or at the same location as the feed line.

Unfortunately this does require dropping the coroplast, but it's not too tough of a job.

Howard

[Cate&Rob]

Another idea . . . If you connect air pressure to the black tank flush and the vacuum break valve is leaking . . . you might be able to hear hissing air from the valve location.

Rob

[LMorganMNx]

Mystery solved. For my 2018 Imagine 2150rb, the access panel is in the bottom shelf area next to the shower.