I don't have your unit, but mine also has identical coloured dump valves. Don't really remember seeing any rigs with coloured dump handles all too often. In my case (aside from just memorizing them) I was able to tell by the diameter of the pipe. The grey is significantly smaller than the black. Don't know your setup but if you can see yours, this may help.
Sent from my iPhone using Forest River Forums
There's no use crying over spilled milk, unless it's on your keyboard.