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Proline Series 1/4-in x 3/8-in Compression Adapter Fitting in the Brass Fittings department at Lowes.com
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Larsen Pipe Fitting, Brass Adapter, 3/8 Female Compression x 1/4 In. Male Compression | West True Value
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Amazon.com: SharkBite 1/4 Inch (3/8 Inch OD) Compression Stop Valve Connector, Push to Connect Brass Plumbing Fitting, PEX Pipe, Copper, CPVC, PE-RT, HDPE, U3523LFA : Everything Else
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