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LTWFITTING 3/8 in. OD x 5/16 in. OD Flare Brass Reducing Coupling Fitting (5-Pack) HF42R6505 - The Home Depot
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LTWFITTING 3/8 in. O.D. x 5/16 in. O.D. Brass Compression Reducing Coupling Fitting (25-Pack) HF62R6525 - The Home Depot
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Transmission Line Adapter - 3/8" Steel Compression to 5/16" Rubber – AGS Company Automotive Solutions
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LTWFITTING 5/16 in. ID Hose Barb x 3/8 in. MIP Lead Free Brass Adapter Fitting (5-Pack) HFLF39185605 - The Home Depot
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Hillman 5-Pack 5/16-in x 3/8-in Threaded Coupling Adapter Fitting in the Brass Fittings department at Lowes.com
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