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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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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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EDGE INDUSTRIAL 3/8" X 5/16" Hose ID Brass Barb Reducer SPLICER Fitting Fuel / AIR / Water / Oil / Gas / WOG (Qty 1): Amazon.com: Industrial & Scientific
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Amazon.com: Beduan Brass Hose Barb Reducer, 3/8" to 5/16" Barb Hose ID, Reducing Barb Brabed Fitting Splicer Mender Union Air Water Fuel : Industrial & Scientific
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LTWFITTING 5/16 in. O.D. Comp x 3/8 in. MIP Brass Compression Adapter Fitting (5-Pack) HF685605 - The Home Depot
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