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Thanks Terry, I think it makes sense now. I included the revised picture below just in case someone is interested.

Thanks Terry, although I have seen that diagram several times, it wasn't until I read what you wrote that it made more sense. I revised my picture to what I think is a better arrangement, and I think I can still squeeze it into the space I have. I show a main stack wye hooked into a sanitary...

Yeah, I thought that might be bad since it is pointing upstream. I can't possibly pipe it with the wye the other direction though. Can I use a side outlet tee or a sanitary tee for the toilet vent instead of the wye? If the 4x4x3 san tee with a 2" side inlet is illegal, I could go with a wye...

Drawing of pvc replacement Thanks for the reply. I guess that the original fitting is really not vented correctly. Assuming that I can get the thing cut out, I would like to replace it with PVC. I made up a drawing of what I want to replace it with (black pipe is the original iron). I...

We are planning to finish out our third floor with some dormers and a new bathroom. The house originally had just a first and second floor bathroom, and all the plumbing is old cast iron. The first floor toilet has a 2" vent coming vertically out of the behemoth iron fitting, and it goes up...