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LTWFITTING 5/16 in. O.D. Comp x 3/8 in. MIP Brass Compression Adapter Fitting (5-Pack) HF685605 - The Home Depot
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Hillman 6-Pack 5/16-in x 1/4-in Threaded Coupling Adapter Fitting in the Brass Fittings department at Lowes.com
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Parker - Industrial Pipe Adapter: 1-5/16-12 x 1" Male Thread, Male Straight Thread O-Ring x Male NPTF - 72519150 - MSC Industrial Supply
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