But pay attention to post #31 of that thread.Presume the tub is vented already. I think your question corresponds to the discussion in this thread: https://terrylove.com/forums/index.php?threads/is-this-wet-vent-of-a-toilet-ok-theoretical.89201/
So vent the tub and tie back into the vent up above the WB somewhere?Only thing is the w/m cant be vent on the tub like that what about a seperat vent in wall for both and tie vent above the box or attic?