I'm remodeling my basement and need to move my laundry room. All of the drain lines are already in (there was a bathroom there before) The only problem I see is that the new utility tub will be kind of far from the main stack (10 to 15 feet away) Running a new vent will be difficult, and costly. Does anyone have any opinion on using an Air Admittance Valve? Any suggestions on best practices for installing it. The model I found online is "Air Admittance Valves by STUDOR"

Also, 1.2 inch is typical for a utility tub drain, isn't it?

You help is appreciated.