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Amazon.com: JoyTube 1/4" Male to 1/4" Male NPT Hex Nipple 304 Stainless Steel Threaded Pipe Fittings (Pack of 5) : Industrial & Scientific
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Amazon.com: DAN SPEED Hex Nipple 2" Male x 2" Male 304 Stainless Steel threaded Pipe Fitting NPT (2 inch) : Industrial & Scientific
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912945-2 Nipple: 304 Stainless Steel, 2 in Nominal Pipe Size, 2 1/2 in Overall Lg, Threaded on Both Ends, NPT | Imperial Supplies
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New 1/2"nps Full Thread Nipple, 75mm Length Stainless Steel 304, Pipe Fitting, Homebrew Hardware - Bar Tools - AliExpress
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Sigma ProConnex 3/4-in Zinc-plated Steel Threaded Nipple Conduit Fittings in the Conduit Fittings department at Lowes.com
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