Dump valve labeling

[cedar creekin]

Hi everyone, Just picked up a 2003 cedar Creek 36rlts. I have three dump remote dump valves (two in front of the sewer pipe, and one behind) but none are labled. Wondering which is which?
I was told that the black water valve isn't sealing properly, and needs repaired.
Any hints/tricks before I pull the underbelly to make the repair.
I'm guessing the cable may be the issue,

[cardinal4fun]

Just a quess front to back Black- Gray-Gray (Galley), I figured out which was which by filling up one tank at a time then empting it. I labeled the handles on the out side of unit with just a small piece of duck tape. Black for the black tank and gray for gray etc. As for the black tank valve there are alot of factors involved here. If the valve moves alittle just working it back and forth may free it up. There are cleaning products on the market that will help with the movement of the gate valve. The gate valves are easy to replace, the hard part is getting to them.

[cedar creekin]

Thats a good idea, I'll add water to the tanks one by one, and figure out which is which. I dread pulling the belly down. but I guess it has to be done.

[kablair]

Get a clear extender or elbow to put on your outlet.

Labels on my black and grey water were reversed. The dealer found out the hard way when he opened up the valves to drop the grey water he had created - residual black water ran across his yard....

[showtime0022]

Not sure what maker of dump valve you have. Mine are made by Valterra. They sell replacement handles for 3 dollars. Best of all they come in black or grey. So I have installed the correct color for the correct valve. You also just paint them.

[Terier]

My black tank has the larger pipe going to it.

[cedar creekin]

Mine is all sealed in the belly. I wont be able to tell until I pull off the insulation.
Thanks for all of the suggestions.

[showtime0022]

Waste valve is normally 3 inch valve