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Auto Vents aka Air Admittance Valves for Plumbing
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VENTING 101 - Air Admittance Valve Pros and Cons
Magic Vent® Video
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plumbing - Install air admittance valve to solve musty smell (sewer gas)? - Home Improvement Stack Exchange
CodeNotes: Installation of air admittance valves - ICC
Auto Vents aka Air Admittance Valves for Plumbing