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John Guest Acetal Copolymer Tube Fitting, Union Straight Connector, 1/2" Tube OD (Pack of 10): Push To Connect Tube Fittings: Amazon.com: Industrial & Scientific
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John Guest 3/8 in. O.D. x 1/4 in. O.D. NPTF Polypropylene Push-to-Connect Reducing Fitting 803159 - The Home Depot
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