316 Stainless Steel, 1/2 in x 1/4 in Fitting Pipe Size, Reducing Adapter - 1DFY3|8-4 RA-SS - Grainger
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Yakamoz Quick Release 1/2-Inch Square Drive to 1/4-Inch Hex Female Socket Adapter Converter Chuck Adaptor for Impact and Ratchet Wrenches - Amazon.com
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Amazon.com: POWERTEC 70147 4-Inch OD to 2-1/4-Inch OD Hose Reducer Adapter for Dust Collection Systems : Tools & Home Improvement
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