STUDOR, INC is the distributor of the STUDOR® brand of Air Admittance Valves (AAVs) for the plumbing industry in the USA, Canada, Mexico and Puerto Rico.

The Studor AAV can be used in lieu of expensive and complex plumbing (open pipe) vent systems that penetrate roofs of buildings.

The purpose of vents is to allow air to enter the plumbing drainage waste and vent system and equalize pressure when water drains out of the system maintaining the integrity of the water trap that prevents sewer gases from entering the building through fixture drains.

When a plumbing fixture is operated, negative pressure causes the AAV to open, allowing air to enter and equalize the pressure in the system. When the flow stops, gravity closes the valve preventing sewer gas from escaping through the valve into the building.


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• Studor Engineering Technical Manual