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Hillman 5/8-in x 11 Zinc-plated Steel Regular Coupling Nut in the Coupling Nuts department at Lowes.com
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Forney 49729 Galvanized All-Thread Rod Coupler, 5/16" x 18 - General Hardware And Construction Equipment - Amazon.com
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Sigma ProConnex 1/2-in Zinc-plated Steel Threaded Coupling Conduit Fittings in the Conduit Fittings department at Lowes.com
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Hex Coupling Nuts - Rod Coupling Nuts - Threaded Rod Coupler - Coupling Nuts - 10-24 x 3/4-5/16 - (5/16" AF) | 18-8 Stainless Steel (Quantity: 175): Amazon.com: Industrial & Scientific
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National Hardware N182-710 Threaded Rod Coupler 1/2 Inch 13 TPI Galvanized Steel: Threaded Rod Couplers (886780007169-1)
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