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-Thanks for the clear and very helpful message. -I will add an AAV at VS1 ( I was thinking of converting C/O1 to a dry vent), but the AAV is much better. -I know that codes were written for good reasons and I want to follow them, hence why I'm posting here. But is it really a bad idea to wet...

Edit: I added a clearer diagram, and another diagram of multiple WC on a single vent. Hi everyone, 4 years ago I purchased a 30yrs abandoned home and started doing its remodel. The house is 1 level on a concrete slab and all the plumbing was Cast Iron for drains and galvanized pipes for water...