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John Guest 5/16 in. O.D. x 5/16 in. O.D. NPTF Polypropylene Push-to-Connect Coupling Fitting 803199 - The Home Depot
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John Guest 3/8-in x 5/16-in Push-to-Connect Reducing Connector (10-Pack) in the Push to Connect Fittings department at Lowes.com
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John Guest 5/16-in 1/4-in Push-to-Connect 90-Degree Reducer Elbow (10-Pack) in the Push to Connect Fittings department at Lowes.com
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