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Black tank drainage

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Michael H

RVF Newbee
Joined
Dec 3, 2025
Messages
1
We have recently purchased a 2021 Riverstone Legacy 39 FBRK. It is 1.5 bath unit. Way more complicated than my older Allegro Bus pusher.

I am having fits getting the tanks cleaned. The lower galley Grey and black tanks are good now. The upper bath Grey and black tanks are close to full after opening drain valves.

On the outside wall there is a black tank flush hookup for the lower tank (with the hidden T valve under the unit. On the inside of the water closet there is what appears to be another flush type hookup, but is not labeled. Can anyone confirm this is for the upper, main bath black tank?

FR manuals such! Thank you very much!
Mike
 
If you can, pull the wall behind the water inlet and see where the line runs. I cant think of anything else it would go to other then fresh water fill. But a nice unit like that usually does that by turning valves.
 

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