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Amazon [amazon.com] has DEWALT 3/8-Inch Industrial Air Coupler with 3/8-Inch FNPT (DXCM036-0240) for $6.66. Shipping is free w/ Prime or on $35+.

Product Description from Amazon:[list][*]Enhanced Industrial Airflow: Engineered with a large 3/8″ body that delivers a powerful 75 SCFM @ 90 PSI—nearly double the flow of standard 1/4″ couplers—to maximize the performance of air-intensive tools.