Any ideas what this is for? It is under the home on the commode drain line.
Maybe the plumbers had some leftovers they wanted to get rid of??
Looks like a sorry attempt at an island (or high loop) vent.
And the AAV is serving what?
This system is fubar and needs some correctin’.
Mike,
It looks as though that pipe is in the crawl space…Did you map it out? Im curious to know what it is connected too.
Paul Pendley
Premier Property Inspections
How far away is the nearest vent, VTR? We used to do that when we were pressure testing, and then would later connect the vents.