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
It is possible that your drain line is into the tank too far. When it becomes under water then it would have to put pressure on the tank to drain. This can happen because you are using the drain line for the vent line. If there were a separate line for the vent it could always allow air out of the tank. Draining into a tank is not like draining into an open ended line. The tank that has the outlet closed needs to allow air out, the opened tank needs to allow air in. The automatic vent will only allow air in.
