3300rlb, which one is which?

We have an '09 3300rlb. We will have to dump just a gray tank. Does anyone know how to tell which gray tank is which?

On mine the gray no 1 tank is the front lower one, When I dumped the 1st Gray and opened the no2 valve with the no1 valve still open, the tank no 1 filled and the no2 tank emptied. No1 tank is the Bath and no2 is the kitchen sink

caissiel said:

On mine the gray no 1 tank is the front lower one, When I dumped the 1st Gray and opened the no2 valve with the no1 valve still open, the tank no 1 filled and the no2 tank emptied. No1 tank is the Bath and no2 is the kitchen sink

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all the tanks are at the same elevation, in between the frame rails under the floor. the black tank is toward the front of the trailer, just behind the landing gear. then just behind that is grey #1 (bathroom). next is the fresh water tank, just in front of the axles. then just over the axles is grey #2 (galley, or kitchen). all at the same elevation, just below the floor.