Pictures https://imgur.com/a/olBlrHG basically explain it. It was a "full bath" when we bought it and sold as one, (and its recorded as such for tax purposes). I want to convert it to laundry room/shower. Location is Baltimore, MD. I need a 2" for shower and a 2" for laundry/utility sink.
Based upon my current set-up, is the correct way to just dig down and tie in a no hub 4" x 2" branch? I know I will have to vent, thinking AAV for ease/cost but willing to roof venting if necessary. Slab is old and around 2" think, so easy to cut out. Already cut a small section at old lav to see condition of existing drainage.