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The Plumber's Choice Black Steel Pipe, 3/8 in. x 6 in. Nipple Fitting (Pack of 10) 3860NPBL-10 - The Home Depot
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Metalwork 304 Stainless Steel Pipe Fitting, Hex Countersunk Plug, 1/8" NPT Male (Pack of 5) - Amazon.com
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SteelTek 3/8-in Structural Galvanized Coupling in the Structural Pipe & Fittings department at Lowes.com
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Parker Stainless Steel 316 Pipe Fitting, 90 Degree Street Elbow, 1/4" NPT Male X 1/8" NPT Female: Industrial Pipe Fittings: Amazon.com: Tools & Home Improvement
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TAISHER 2Pcs Stainless Steel Pipe Fittings, 3/8" NPT x 3/8" NPT Male Threaded, 2" Length Nipple Cast Pipe - Amazon.com
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SS-16-HRN-8 Swagelok Stainless Steel Pipe Fitting, Hex Reducing Nipple, 1 in. Male NPT x 1/2 in. Male NPT
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