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
Bowti wrote:
Not sure if you have found the problem yet, but from what you have posted so far it sounds like your holding tank vent is plugged. The Air Admittance Valve's only purpose is to keep your drain trap from being siphoned dry, which would allow fumes from your holding tank to stink up the place.
Your sink drains good with your tank drain valve open, and gives you problems with it shut so that points to your holding tank vent being plugged. This it what Old B was getting to.
Get on your roof and find out what pipe leads to the tank you are having problems with and unplug it.
I wish I had a roof vent haha stupid island sink doesn't have one so the tanks only vented with the aav
