Sinks not draining/poor venting?
Two new under sink vents and it still is not draining my sinks, if I unscrew the air vent the sinks will suck down like a champ. I can't have a roof vent because I have a island sink, the only roof v...
Forum Discussion
The vent under the sink will work as long as the drain is not under pressure. You could try filling the sink until it won't drain. then carefully loosen the auto vent or use a screwdriver to release the seal and see if the sink will drain and if it is sucking air or discharging air. If I am right about the pipe being in the tank too far it will be discharging air because there will be pressure on the tank.
