In the attachement, which is the correct connection for an AAV vent. The standpipe is for a washing machine discharge. Assume the pipe is 2 inches. I assume (from prior answer) there is a desire to place vent vertically close to the p-trap (2 to 5 feet).

What's the best vertical distance to locate inlet above vent?

Also, does the desired configuration permit a sink connection share the same trap (point B)?

Thank you much!

Hi again Alpac!

Configuration B is correct. The 2" standpipe needs to be 30 - 36" maximum.

Do not use this trap for the sink.

You can cut another tee fitting into pipe a foot or so below the p trap tee fitting for washing machine and run that to sink with its own AAV... piped exactly as config. B you present for washing machine... except sink will be 1.5" fittings at sink.

Keep me posted... I see you are getting close! Mark

Whats the best vertical distance to locate inlet above vent?


Most codes require the AAV to be at least six inches above the weir of the trap.

>shrugs<

I usually put them at 42" in a wall box on a Laundry Standpipe for ease of maintenance.