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Thank you for your replies, Jeff and John. The wet vent is 2" until the 1-1/2" dry vent above it. My main concern is whether the high velocity of waste from the lav would siphon the tub p-trap. The tub is in a guest bathroom and will rarely be used, while the lav is in a main bathroom that...

Reading this article, with its main diagram repeated below, it looks like the tub wet-vent might not be proper here? Do I need to turn the wye on its side, so that the lav enters 45 deg (or less) from the horizontal? (That's the bottom-right situation in the image below.) Could I instead...

I'm planning a remodel underneath two bathrooms (photo is looking at the upper bathrooms from below). It looks like tub trap arm is wet vented by a 2" wye going straight up to the lav above. That lav has a 1-1/2" dry vent on the upper level (and no other fixtures on the same 1-1/2" dry vent)...