Anderson Metals 3/8 In. Barb x 1/4 In. MIP Nylon Connector - Tiger Island Hardware
LTWFITTING 3/8 in. ID Hose Barb x 1/8 in. MIP Lead Free Brass Adapter Fitting (25-Pack) HFLF39186225 - The Home Depot
3/8" MNPT x 1/4" FNPT Reducer Bushing Hose Fitting | Milton Industries — Milton® Industries Inc.
Proline Series 3/8-in x 1/4-in Barbed Splicer Adapter Fitting in the Brass Fittings department at Lowes.com
LTWFITTING 1/4 in. x 3/8 in. I.D. Brass Hose Barb Reducer Splicer Fittings (50-Pack) HF3913R060450 - The Home Depot
LTWFITTING 1/2 in. x 5/8 in. I.D. Brass Hose Barb Reducer Splicer Fittings (5-Pack) HF3913R100805 - The Home Depot
2pcs/Lot Brass Hose Barb OD (1/4" to 5/16",5/16" to 3/8",3/8" to 1/2") for Air Water Fuel Hose Adapter Joiner Reducer Connector - AliExpress
Amazon.com: Metalwork Brass Reducing Hose Barb Splice T-Fitting, Reducer Tee Union Mender Joiner, 10mm Barb x 6mm Barb x 10mm Barb, 3/8" x 1/4" x 3/8" Hose ID (Pack of 2) :
U.S. Solid Brass Hose Fitting, Adapter, 1/4" Barb x 1/8" NPT Male Pipe Fitting, 1/4"x 1/4", 3/8" x 1/4", 3/8"x 3/8",1/2"x 1/2", 3/4"x 3/4" - U.S. Solid
Amazon.com: JoyTube Hose Barb Reducer 3/8" to 1/4" Barb Hose ID Stainless Steel Reducing Union Fittings Air Water Fuel (Pack of 6) : Industrial & Scientific
3/8" Hose ID x 1/4" Hose ID Black HDPE Reducer Connector | U.S. Plastic Corp.
3/4" Male x 1/4" Female NPT Hex Bushing Adapter Pipe Reducer Brass Fit – compressor-source