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Thanks for the input. Great recommendations. I will replace the lav santee as you suggest with 1-1/2" at the trap arm inlet. And I will ensure the drop of the tub trap arm does not exceed 2".

The lavatory, WC and bathtub in the master bath are all independently dry vented (original construction 1965). I want to wet vent the bathtub via the lav so that I can eliminate the tub's original drain and vent pipes (that gives me a pipe-free wall and would allow me to make unrelated...

The lavatory, WC and bathtub in the master bath are all independently dry vented (original construction 1965). But the bathtub's drain and vent are inconveniently located in a wall where I want to make some unrelated changes. So I am considering wet venting the bathtub via the lav so that I...