can I use 2" pipe to vent my washing machine?

[Jmaclicious]

Just wanted to be sure 100% I could use a 2" pipe for my venting to the washing machine, I have 2" drain line with 2" horizontal run with in-line backwater valve but I wanted to add the oatey sure vent AAV on the venting portion for when the inspector is dancing around my house when the electrical is getting done, I couldn't find a 2 x 1 1/2 x 2" sanitary tee at my local hardware store but I have a 2x2x2" one, also the oatey sure vent will handle the 2" pipe and I have lots of 2" pipe anyway.. good to go or should i get a 2 x 1.5 reducer coupling and put the venting portion to 1.5 " ?

[A. Spruce]

AAV are not approved for laundry venting, at least not the last time I wanted to use one for this purpose. Check with your building department, they will tell you if it's ok or not to use one.

[Shannon]

Ya many places do not allow AAVs so check that first. But to answer your question 2” pipe would be fine.