I’m looking at this setup and can’t figure what looks wrong to me. It’s going to be one of those days.
Both of these are vents, both dry vents, the left one is original and connects to a central basement floor drain, the right one vents a basement bathroom which actually drains into the left one so this is the top of a big PVC pipe square.
Is this a flat vent?
Is the fitting at the top left incorrect?
EDIT: Solved. This is a wet vent and my subject was absolutely incorrect! Supposed to say “can’t think”.