Quote:
Originally Posted by npwalters
Well I learned something today with the help of the person that identified this as a studor valve. Note that this is a one way valve and only opens to intake air on demand.
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Yep, and they can fail, sticking open or closed. If your sink drain starts to suck air (which will empty the trap creating an open route to sewer gas smell), you know what to check. Also, if there is sewer gas smell in the attic, ditto.