I'm going to be installing new plumbing in my basement for the Laundry setup (moving it)
Can you use an Air Admittance valve in place of a vent for the plumbing (they are permitted by code in my boro)? How do you size them for a 2" drain pipe?
This will be plumbed into a 4" secondary stack that is roof vented (and ties into the main drain under the floor) but as I understand it I should still vent this.
Roof venting is not really an option for this drain.