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Air admittance valves (AAVs, or commonly referred to in the UK as Durgo valves and in the US as Studor vents and Sure-Vent®) are negative-pressure-activated, one-way mechanical valves, used in a plumbing or drainage venting system to eliminate the need for conventional pipe venting and roof penetrations.
In the United States, plumbing codes usually provide strict limitations on how far a trap may be located from the nearest vent stack. When a vent cannot be provided, an air admittance valve may be used instead. These devices avoid negative pressure in the drain pipe by venting room air into the drain pipe (behind the trap).
It captures odours at the source through an intake and quiet fan, purifies the air with an odor-absorbing activated carbon replaceable filter, and freshens the air with a fragrant vent. It is powered by two D-cell batteries, which last up to 9 months. It was pulled out of the market in 2011, due to high manufacturing costs and low demand.
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TL;DR: As of May 6, get the CLEAN BOWL UV Sanitizing Light for Toilets, which also sprays a pleasant scent and illuminates your bowl for nighttime use — on sale for 37% off — just $24.99.There ...
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