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Premier air gap prevents draw back into dishwasher from garbage disposal or sink Made of solid brass head with polypropylene body Overall cap width measures 1-3/4-Inch by 5/8-Inch It has a dishwasher inlet and an outlet that measures 7/8-Inch It mounts in a 1-1/4-Inch to 1-1/2-Inch diameter hole with maximum deck thickness measuring 2-1/8-Inch