Actually, it does. I just took apart the motor assembly of a spare 2215, and it does in fact come into contact with water. I thought it would not, but apparently it does. The external connector is part of the top assembly, and then runs halfway into the motor cover, and the other half comes up from the motor assembly. They meet in the middle, and are sealed by a small O-ring. The separation of this joint would be my only concern, as it will result in an empty tank if not caught.
Vibration could be another issue also, but quite secondary to an empty tank.
Everything aside, I think you're still good to go.