I am helping a friend who bought a house with the plumbing. I love to plumb when I don't set tile and have gotten pretty good. Is it kosher to install a 4" pvc soil adapter into a cast hub pack it with oakum and then pour a lead joint and pack that? Well I did and its rock solid. Also when running a box to drain a washing machine that has the 2 valves in it, do most put the trap in the stud bay or below the subfloor before the pipe goes through the 2x4 plate. Thanks Also heres a bad drawing I made. The area circled I added. Where do I add the vent? The house is gutted its still not glued where should the vent be? thats a general drawing but its what I did.