Drain Vent Pipe
A Vent Pipe is installed through the roof to allow sewer drains to breathe and prevent noxious gases entering the house.
WIKIPEDIA ENTRY DRAIN WASTE VENT SYSTEM.
A Vent Pipe is installed through the roof to allow sewer drains to breathe and prevent noxious gases entering the house.
WIKIPEDIA ENTRY DRAIN WASTE VENT SYSTEM.