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Old 07-18-2015, 07:37 AM   #2
Festus2
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Join Date: Mar 2009
Location: Fraser Valley BC Canada
Posts: 7,015
That "thingy" is called a cheater vent. It takes the place of a roof vent for your kitchen sink plumbing. It may be cracked or have worked loose causing odors to escape. It can be taken apart and/or replaced. Don't tape it shut.
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