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Proline Series 3/8-in x 3/8-in Threaded Male Adapter Union Fitting in the Brass Fittings department at Lowes.com
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JEGS 63248: Brass Adapter Fittings | 3/8 in. NTP x 5/8 in. -18 Inverted Flare Female | Fits 3/8 in. Hard Line | Sold Individually - JEGS
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Milwaukee SHOCKWAVE Impact Duty 1/4 in. x 3/8 in. Alloy Steel Square Socket Adapter 48-32-5031 - The Home Depot
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SUNEX TOOLS 3300 3/8-Inch Female by 1/2-Inch Male Socket Adapter with Friction Ball Drive - Amazon.com
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