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Hi, Paula! Thank you for this inquiry. Yes, most local plumbing codes require dishwashers, including this model unit, to have an air gap to prevent backflow and protect your water supply. The air gap creates a physical separation between the dishwasher's drain and the home’s plumbing system. Also, please check out 'Care of Drain Air Gap' on page 15 of the complete owner's guide on how to clean it: https://content.syndigo.com/asset/22f5b2ac-92a6-474e-acc7-915d3d73642f/original.pdf ~Juan
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