Tank Flush Diverter Valve

[BobD17]

I can’t find anywhere in the owner’s manual the purpose or operation of this switch. When I flush my black tanks I’ve been selecting the tank I’m flushing is this correct purpose of this switch?

[Firewrench]

Yes you are correct, but on our 21 Accolade the lines from that valve are backwards. Not a huge deal, I noticed it the first time I dumped tanks. Was trying to flush front tank but could hear the water flushing the back tank. And vice-versa. You might want to double check.
I changed the label with a sharpie.

[BobD17]

Thanks. I think I have the same problem that’s why I asked the question.

[Timdog]

You can hear which tank is being flushed. Then mark it on the control valve with a sharpie. I marked it 1/2 bath and full bath. Do not run the flush water in the tanks without the main dump valves being open! Don't ask me how I know