Cast drain: horizontal to vertical (main stack)

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JaCkaL829

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Hello,
I have some older cast iron drain pipe I believe 4” that ties into the main vertical stack that need to be replaced due to cracking from within. This only services a toilet and sink for a powder room. I would like to replace with 3” PVC and follow the same path as what’s in there now. I’m just wondering if I can make the same transition horizontal to vertical that is already there with 3” PVC and a regular 45 elbow? I plan on adding a PVC cleanout in the same place and using a 45 wye that is 4”x4”x3” in the main stack. Let me know if this works or if I should do something else. The span before the 45 downward drop is about 8’ of horizontal that there isn’t a whole lot of room to move around.
Thanks!
 

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Terry

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3" works for a toilet and lav.
If you're redoing what you see, I would guess it should be fine. I can't see where you're going from there.
 
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