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Home Improvement, Design, and Decorating
Reply to "Sewer gas smell in house "
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[quote=Anonymous]Often this is caused by a leaking air admittance valve (AAV). AAV's are typically fitted to sinks so that a big sure of drainwater from a toilet flush or bathtub being emptied doesn't create a vacuum which sucks the water out of the sink trap. If you look under the sink, follow the drain pipe and look for a pipe going up under the cabinet, that would go to the AAV. They can be unscrewed and replaced, it's a one-minute job once you find it. The other common cause is the trap in a seldom-used drain has gone dry. You see this a lot in floor drains. Pouring some mineral oil into the trap will keep this from happening. [/quote]
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