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09-29-16, 09:55 AM
Replies: 6
Views: 4,087
Posted By Zorfdt

That's called a Philadelphia (or Pittsburg) vent,...

That's called a Philadelphia (or Pittsburg) vent, depending on where in PA you are. Down below that is a trap. This provides a vent for that trap, so you typically want to keep it vented and not...
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