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Thank you all, may end up attaching the LAV to the shower drain, may go with the AAV on it, but regardless looks like I will be doing a 3" horizontal wet vent just for that very brief run, then going right into a 2" vertical vent above it. Appreciate the help

Thanks, I think I can get that angle greater than 45 to level so should be good there. I’ve got to keep that through the roof vent tho - that is the houses only vent to air. I may end up rerouting the sink tho if feasible. Things are pretty tight as is

Mapping it out it looks like a horizontal vent might be easier to accomodate. My whole issue is trying to avoid a joist (shown in picture). I am running underneath the joists but then have to curve upwards to get into the existing hole for the vent. Can you tell me if I am correct to do so in...

Thank you - should that shower branch connect back to the toilet branch (on the 4x4x3 wye drawn) connect on a 45 - 90 degree since it’s a wet vent?

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Hi all. Does this setup look feasible? I have an old home so am stuck with the layout. Main question is whether the 3" wet vent pipe connection between shower and toilet branches should connect to horizontal branch at 90 degrees. I am leaning that way since it's a wet vent. I am trying to go to...