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Remodeling a main floor bathroom in a 2 story house. The current plumbing had no vents for the shower and sink. The sink had an s-trap installed when I removed it. I have no idea how this ever worked without it being vented. So, the challange I have because of the second story. There is currently a vent pipe for the toliet in the room, so can I vent the shower and sink into this vent pipe by running the vent up through the wall and through the celing. I was thinking of running 2" pipe from the shower over to the sink from below, then drop the sink drain into the shower 2" drain. When I drop down into the 2" pipe, I was going to put a tee in to go up the wall and over to the toilet vent. Would this work, or do I have to much distance from the shower to the sink to be able to vent it like this. I have attached a file of the layout of the bath. Any help would be greatly appreciated.
