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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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Eaton - Steel Flared Tube Female JIC 37 ° & Swivel to Male Pipe Adapter: 3/8" Tube OD, 3/8 Thread, 37 ° Flared Angle - 06682124 - MSC Industrial Supply
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