Here is what I found on my RW413.
Front Left valve is Black Water for front Bathroom.
Front Right valve is Gray Water(front bath shower and sink) Both valves drain out front sewer drain
Rear Top valve is Black Water for rear bathroom. (Drains out of rear sewer line)
Rear bottom valve is Gray...
I also recently purchased a new RW 413. One thing I would suggest is to take copious notes when they go over all of the systems with you. The excitement of delivery(pick up) seems to be to your brains detriment and I was left wondering what this switch was for or what position to put something...
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