Suds lock? in kitchen sink drain plumbing
Our fiver, like most, has a separate gray tank for the kitchen sink. The vent going up to the roof is 8 or 9 feet away from the sink. The P trap is a couple of feet to the right of the left hand bow...
Forum Discussion
The roof vent works both ways. It allows air out of the tank when it's filling, and air in when it's draining. As said, the AAV only lets air in the line to break the suction that would otherwise cause slow drainage from the sink.
