Durgo Vent

Why have holes in the roof when air admittance valves can be mounted inside, beneath the roof?

Durgo, the original air-admittance valve with design and installation flexibility, is preserving the overall appearance of roof and providing extra protection in case of fire and early warning of blockage in the drainage system.

AAV's allow air to enter the plumbing system through the vent instead of drawing the air through the trap. When air is sucked through the trap the water seal is no longer in tact and will let harmful foul smelling odors to enter the living area.

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