Great Forum. This weekend I went to move a 2nd floor toilet 6 ft from existing spot to create an alcove for it. I opened up some of the first floor ceiling to see what I was up against. Below is what I found. Toilet is direct to 3" soil stack. The tub and shower have branch drains to the 3" soil stack which runs down the front wall of the house. Tub and shower are vented to vent stack at back corner of house. First question is, am I missing a vent for the toilet? If so, any ideas how to easily fix this?