Chuck Christopher
Member
The sink I am putting in this apartment has a wall I can use for the vent pipe and is about 5 feet away, but the drain pipe from the sink has a long way to go and the drain pipe has to stay inside the floor joist, I need to keep the pipe as high as I can at the sink. In the picture I drew , can I vent the island sink drain right off the back of the drain pipe ? I downloaded a lot of pics off the internet showing venting , but none of the pics show venting straight off the back.