How about a circuit vent? Bring the relief vent, if needed, over above the photo?In your first picture,
That would require that I read the section on circuit venting. : - ) Is the idea to circuit vent the two lavs only, so basically the piping drawn in black in both of the OP's photos?How about a circuit vent? Bring the relief vent, if needed, over above the photo?
That was my thinking -- least change.That would require that I read the section on circuit venting. : - ) Is the idea to circuit vent the two lavs only, so basically the piping drawn in black in both of the OP's photos?
One of these guys......When you say "tee" you'd need a combo (tee-wye, wye + 45, lots of different names).
That looks to me to be a compliant wet vent per the Illinois Plumbing Code, as long as you use a 1-1/4" p-trap on the righthand lav:
https://www.ilga.gov/commission/jcar/admincode/077/077008900K15000R.html
Part (d) says if you used a 1-1/2" p-trap on the right, your horizontal lav drains would need to be 2", but it looks like the existing you want to tie into is 1-1/2".
Cheers, Wayne
http://media.iccsafe.org/news/icc-enews/2018v15n13/2018SC-IPC802.pdf describes a standpipe trap shared with a laundry tub. As I read it, the 2018 change was to allow it in apartments, and this was available for houses in earlier versions.UPC 1001.2 "Each plumbing fixture shall be separately trapped by an approved type of liquid seal trap." (with a later exception for multiple sinks in some cases)
https://up.codes/viewer/california/ca-plumbing-code-2019/chapter/10/traps-and-interceptors#1001.2
IPC 1002.1 is similar.
https://up.codes/viewer/colorado/ipc-2018/chapter/10/traps-interceptors-and-separators#1002.1