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On the side of the disposal, there is a tube, 1/2 inch diameter and 1 1/2 inches long. This is for the discharge line from a dishwasher. The knock out plug in in that tube. If you do not have a dishwasher, you leave the plug in so that the disposal will not leak. Having the dishwasher empty into the disposal helps keep it clean and free of food particles.

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Q: What is a knockout plug for a garbage disposal?
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