Multiple Grey and Black Holding Tanks

[blackysc]

We have a 2017 Columbus by Palomino 383FB, and we have a question about holding tanks. According to the control panel, we have two black and three grey tanks. We've already determined that one of the sensors labelled as grey is actually black. The real question is, if there are three grey tanks, where is the third dump valve?

[mikkeeh]

Not sure... But check underneath near the main dump valve. I have a Crusader 295 rst. Black and gray valves are in a compartment where the water hooks up. Away from that.... Underneath is another gray valve handle. Good luck

[blackysc]

Thanks. We'll see if that helps, but I think we've found the valves that are near the main dump. I'll definitely take another look to be sure.