Sink vent
I'm doing a kitchen remodel and have an opertunity to get rid of the "cheater valve" and run a real vent. My question is, do I really need to run 1 1/2" pipe for just the vent or could I reduce it dow...
Forum Discussion
True, but they can also be sucked dry when a sink with a lot of water is drained and the drain line between the sink and holding tank becomes full of water. The water creates its own vacuum and if not enough air can mix with the slug of water in the pipe it will pull all the water out of the p-trap too. It's not for only when the tank is drained.
