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John Guest 3/8 in. Push-To-Connect x 1/4 in. FIP Polypropylene Adapter Fitting 803379 - The Home Depot
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JOHN GUEST 3/8 in. OD x 3/8 in. NPTF Push-to-Connect Female Connector Fitting (10-Pack) PP451223W - The Home Depot
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John Guest 3/8-in Push-to-Connect Coupling (10-Pack) in the Push to Connect Fittings department at Lowes.com
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