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OK, I think it's getting more clear now. Thanks for all of your help. I had just vented the sink out in the first pic, but now I am venting the 4" near the cleanout, and the sink. I guess the question is whether the 2" can support all that. Upstairs - 1 sink, 1 toilet, 1 tub 1st floor -...

The diagram has been edited - a floor drain connects into 2" vent before entering 4" sewer. I've already knocked out a lot of my cement floor, so I'm trying to not knock out more. The 4" line is not right next to a wall, so it would be hard to get a vent out from the tub and toilet to the...

OK, so obviously I don't know my terminology, thanks for the input. The 2 vertical pipes are: a 4 inch stack and a 2 inch vent, both go vertical basement floor to attic. This is a house built in the '20s, so I'm sure the plumbing requirements were much less stringent at the time. All...

Diagram Sketch has been edited a couple of times, this is the most recent My real question is the 6 ft rule - does it apply here, or does having multiple drains within 6 feet change anything?

I have 1 bath in my home on the 2nd story, adding a 2nd bath in my basement. The toilet on 2nd floor is wet vented to a 4" stack (full vert venting out roof) that drops through the basement. There is a 2" vertical vent that runs alongside the stack for the sink vents. I'm adding a toilet...