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Amazon.com: KOOTANS 1/2 NPT x 3/8 NPT Male Solid Brass Hex Nipples, Heavy Brass Pipe Adapter Fittings Reducing Nipple Connectors 4Pieces : Industrial & Scientific
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Parker - Industrial Pipe Adapter: 1/2″ Female Thread, 1/2″ Male Thread, MNPTF x FBSPP - 60041951 - MSC Industrial Supply
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LTWFITTING 1/2 in. FIP x 3/8 in. MIP Brass Pipe Adapter Fitting (20-Pack) HF1028620 - The Home Depot
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Reducing Adapter: Brass, 1/2 in x 3/8 in Fitting Pipe Size, Female NPT x Male NPT | Imperial Supplies
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