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John Guest 3/8-in 1/4-in 90-Degree Male Elbow (10-Pack) in the Push to Connect Fittings department at Lowes.com
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Reverse Osmosis RO Water System Fitting 1/4" 3/8" Inch 8mm OD Hose Tube 1/4" 1/2" 3/4" 1/8" Female Plastic Pipe Quick Connectors - AliExpress
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Watts Water 3515-08/P-400 Quick Connect Tube Coupling, 3/8 Inch Plastic, 250 Psi Pressure: Polysulfone Plastic Push It Fittings (098268298550-1)
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Amazon.com: PureSec 1/4 inch to 3/8 inch Union Tee Connector Push to Connect Plastic Quick Fitting for water purification&RO System (5, 1/4" Tube O.D.X3/8" Tube O.D.X3/8"Tube O.D.) : Industrial & Scientific
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PVC Pipeworks 3/4-in Schedule 40 PVC Union in White (8-Pack) in the PVC Pipe & Fittings department at Lowes.com
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Amazon.com: PureSec 3/8 inch Tubing OD Use Straight Union Plastic Quick Connect Fittings for RODI System : Everything Else
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