Primefit Extreme Performance 1/4 in. x 3/8 in. Brass Standard Hose Barb Industrial M-Style 6-Ball Coupler (10-Pack) XIC1438BB6-B10-P - The Home Depot
WYNNsky Industrial Air Coupler, 1/4 Inch Body Size, 3/8 Inch FNPT Threads Size, Brass Air Compressor Accessories Fitting - - Amazon.com
1/4 Female Air Coupler x 3/8 FPT (Industrial Style)
Amazon.com: Beduan Brass Hose Barb Reducer, 1/4" to 3/8" Barb Hose ID, Reducing Barb Brabed Fitting Splicer Mender Union Air Water Fuel : Industrial & Scientific
Air Hose for Pneumatic Tools 1/4 in. Male x 3/8 in. Female Brass Pipe Reducer Coupler Connector Fitting 150 PSI Maximum 1/4 in 18 NPT Home Garage or Professional Shop: Amazon.com: Industrial & Scientific
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Joywayus Barb Reducer 3/8"x 1/4"x 3/8" ID Hose,Reducing Tee 3
Steelman 15-Foot Coiled 3/8-Inch Air Hose With 1/4-Inch Npt Fittings – Steelman Tools
3/8 Inch Air Tube 1/8 1/4 3/8 1/2 Bsp Npt Thread Straight Joint Copper Plastic Fitting One Touch Hose Quick Pipe Connector - Pipe Fittings - AliExpress
Male Hose Barb Fitting 3/8 Inch ID Hose x 1/4 Inch MNPT | Legacy Manufacturing
3/8 Female NPT 1/4 Industrial Quick Coupler Connect Air Hose Fittings M MIL I/M | eBay
Brass Reducer Bushing - 3/8 to 1/4 for air hose
1/4" Barb OD X 3/8" NPT Male End Air Hose Pipe Fitting Connector Adapter 5PCS | eBay
Airbrush Air Hose 1/8" BSP Male to 1/4" BSP Male Fitting Connector Adapter - Walmart.com