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I had to have it installed due to older house and pump force which backed up into sink.
Sorry, there was a problem. Please try again later.Hello Laci - We appreciate your interest in the dishwasher CDT805P2NS1 and we are glad to assist. Some state or local plumbing codes require the use of an air gap between the built-in dishwasher and the drain system of the home. This plumbing device is used to prevent the possibility of back flow into the dishwasher in the event of a clogged drain system. Please check your local plumbing codes regarding the air gap requirement. Thanks for checking. Olga@Café
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