Installation of Cheater Vent
I am trying to diagnose problem with kitchen sink on a recently purchased property that is tenanted. It is vented with a 1.5" cheater vent, the top of which is level with the underside of the kitchen sink. Is this too low and could it be causing slow draining problem? When I remove cheater the sink drains quickly, until it spills over the top of the open pipe and I cap it manually!