Quote:
Originally Posted by rohrmann
The reason for the vent to the black tank is so every time you flush the toilet, you don't have smelly air that was in the tank come into the room when the waste drops into the tank. Also, when the temperature changes in the closed tank with no vent, because you sealed it over, you can build up pressure or vacuum in that tank, which if bad enough, you could have a failed tank.
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No, this is the little one on the back of the toilet