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Can I connect my dishwasher drain directly to the waste disposal or do I have to connect the dishwasher drain to an air gap first?

  • Are you using the dishwasher port on a garbage disposer? That effectively is an air gap itself. The dishwasher then dumps into the disposer chamber and drains from there. – Tyson Sep 18 '16 at 0:15
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If you connect above the U bend or P trap this will work. If the connection is below the U bend or P trap sewer gasses can enter the home these can be both unhealthy and explosive.

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