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Amazon.com: 2 Pack - 316 Stainless Steel 1/4 NPT Male to 1/4 NPT Male Straight Hex Coupler/Coupling for Air, Liquid or Hydraulic Fitting - Industrial Air Tool Hose 1/4 Inch Coupling : Industrial & Scientific
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Merit Brass - Pipe Half Coupling: 1-1/4″ Fitting, 316 Stainless Steel - 36901635 - MSC Industrial Supply
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Southland 1 in. x 3/4 in. Black Malleable Iron FPT x FPT Reducing Coupling Fitting 521-354HN - The Home Depot
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Smith Cooper 3000# Forged Carbon Steel 1/4 in. Coupling Fitting - Threaded - John M. Ellsworth Co. Inc.
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Pipe Fittings Direct. 1 1/4 inch mechant steel full coupling, Class 150, Internal Thread X Internal Thread
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Amazon.com: 2 Pack - 316 Stainless Steel 1/4 NPT Female to 1/4 NPT Female Straight Hex Coupler/Coupling for Air, Liquid or Hydraulic Fitting - Industrial Air Tool Hose 1/4 Inch Coupling : Industrial & Scientific
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Milton S-715ST 1/4" FNPT Industrial Interchange (M-Style) Quick-Connect Steel Coupler — Milton® Industries Inc.
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Sigma ProConnex 1-1/4-in Zinc-plated Steel Threaded Coupling Conduit Fittings in the Conduit Fittings department at Lowes.com
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SteelTek 1-1/4-in Structural Galvanized Coupling in the Structural Pipe & Fittings department at Lowes.com
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