I guess it's an AAVV

[jfrederick (Joshua Frederick)]

This is a first lol

[kleonard (Kevin Leonard, CPI/CMI)]

This should be in the WTF thread.

Maybe they thought there was too much water going down that vent pipe.

[ruecker (Ryan Uecker)]

@kleonard

Maybe they thought there was too much water going down that vent pipe. .

Or they were getting whifs of sewer smell in the yard periodically.

[lhenderson2 (Lon Henderson, CMI)]

Another example of a little knowledge gone astray or unclear on the concept.