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Ahh I gotcha. Yeah this room is at the very end of the drain line before it goes to the outside sewer, so there's a bathroom and kitchen before this room upstairs on the first floor. If I made the shower drain connect to the main line after the toilet/sink (whereas in the diagram, it connects...

Would the vent going up from the sink not vent the shower? If not, I can very easily give the shower it's own vent, I'm just curious as to why it wouldn't vent through the sink's vent stack. I'm not disagreeing with you by the way, I'm honestly trying to learn as much as I can.

As a preface: I just bought my first house, and I'm learning a lot of this stuff as I go, so I apologize for my lack of knowledge. I'm currently installing interior drain tile in my basement. I figured while I have a bunch of concrete busted up, I might as well rough plumb a bathroom I plan...