Black tank back flow location

[greg&bev]

2022 thor 35m neither black tank flush was working,(I have 2) I took it in and one is fixed but the main bath is not.I’m flushing with a 5 gallon bucket ,while effective it’s a lot more work.does anyone know the location of these valves?the washer dryer prep panel was where I was going to start as it’s the high point and both hook ups are on that side.when I blew one in my 5th wheel I just hard piped it and it worked great.(nothing under the sinks) thanks greg

[Judge]

On my '20 Magnitude SV34, the Vacuum Breaker for the Sani-Flush is behind the shower bezel / controls. It was in the same place on my '18 Outlaw 29H.

[greg&bev]

Anyone else have an idea of this backflow location?

[EA37TS]

Check in the upper back corners of the bathroom sink cabinet.

[greg&bev]

Nothing under the sinks I’m thinking in washer dryer prep area?thoughts

[Judge]

If you go to the Thor Owners Website, you can download the schematics for your coach and it will show the location of the Vacuum Breaker.

https://www.thormotorcoach.com/owners