dwv system

I'm redoing an ancient basement bathroom/laundry room. The current setup has a long sweep 4in cast iron elbow dipping under the 4in slab and connecting to the city sewer right at the outside wall. The lateral 10ft of 4in (now PVC) is up at high 78" across the room. The new design will remove...

Hi, everyone. This one’s for the plumbing nerds (like me)… I'm working on the DWV plans for my total rehab house, and I was wondering if anyone had any opinions about which type of wye they like to use when transitioning from a 3" vertical stack to a 4" horizontal in the basement. In my last...