newbie in 2017 238RK

[hawkeye2an]

Complete newbies to TT. I suppose I could just open them each up and smell, but I was hoping someone could tell me which is the black water and which is the grey?

[Chuck v]

The drain gate valves are different sizes -- the black water valve is the larger...

[hawkeye2an]

The drain gate valves are different sizes -- the black water valve is the larger...

Got it now that I looked all the way underneath I see they run to the same discharge. So what is the drain in the back, Water heater drain?

[hawkeye2an]

figured out it is galley tank after my sink wouldn't dran