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304 stainless steel double internal thread direct water pipe joint internal thread screw tube 6-way welding straight through 4 p - AliExpress
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Pipe Fittings Direct. 6 inch NPT weld on mechant steel half coupling, Class 150, Internal Thread X Butt Weld
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Smith Cooper Cast 150# Stainless Steel 6 in. Full Coupling Fitting - Threaded - John M. Ellsworth Co. Inc.
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M5 x 0.80 x 15 Coarse Thread Class 6 Hex Rod Coupling Nut Low Carbon Steel Zinc Plated Pk 25: Amazon.com: Industrial & Scientific
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