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Amazon.com: KOOTANS 3/8 NPT x 3/8 NPT Male Solid Brass Nipples Heavy Brass Pipe Adapter Fittings Equal Hex Nipple Connectors 4Pieces : Industrial & Scientific
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BrassCraft 3/8-in x 3/8-in Compression x Mip Adapter Fitting in the Brass Fittings department at Lowes.com
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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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