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Replaced old double stainless sink with a new one. Plumbed into same wall drain, replaced new trap and pipe to wall. The only addition was I plumbed the dishwasher into drain between sink and trap. New tailpieces with sink are plastic, old was metal. Any suggestions of fixing smell. I now have to keep plugs in the sink to stop smell.

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You may know that a plumbing trap traps water in a loop which prevents sewer gas from flowing into the house. All drains must have a trap including the dishwasher. So the dishwasher discharge hose must be attached to the inlet side of a trap otherwise you get gassed.

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    He says as much in the question: "I plumbed the dishwasher into drain between sink and trap." – isherwood Dec 18 '18 at 20:24

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