Frodo, you showed me exactly what I wanted to see.. I wasn’t sure if I could put a tee(combo or wye on horizontal and shoot to a wall to vent. It seems like an easier way and less pipe.. Thanks so much for taking time to do that…. What’s your illegal 3rd way? Not AAV right, I’m curious if it’s not. Did you see my drawing? Envision existing kitchen drain on wall with vent going straight up.. I wanted to lower santee below floor, stack a cleanout above floor and tie in vent. I then build my bow vent 3 feet away and plumb straight into Santee which would vent similar to shower drain… why would that be illegal? Thanks again for your reply and any other info/knowledge you have.