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Coincidently, I had just discovered the air admittance valve as the source of our under-sink stink.
BTW, the air admittance valve is a one-way valve, the purpose of which is to prevent losing the water seal in the P-trap.
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2016 Montana High Country 310RE
2020 Chevrolet Silverado 3500 HD LT CC 4x4 Duramax 
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