Hello, I am a DIY guy, putting in a second floor bathroom, and want to make sure that my DWV setup is good. Below are images that show how I would lay it out. Someone told me that I could wet vent the Lav from the WC if it was 2", is that right? This may be specific to Oregon/Portland code, right? Would I drain the lav into the toilet drain before it hits the 3x3(x2) bend, or after?
The images are below.