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Hi my name is Robert....
Normally the drain valve for the tank would have have a red handle and be right near the tank, I would see if if the piping is going below the chassis, if it was the drain you would see an opening or tubing below the chassis. IF it is not the drain hard to say IF you can send a picture of what you are seeing it might help... (if it is not the drain for the tank)
Hi.... Was just checking in to see if my answer helped. IF you have more questions or concerns please feel free to contact me, follow ups are included.
Have a Safe and Happy New Year!! Robert