GRAINGER APPROVED Barbed Hose Fitting: For 3/8 in Hose I.D., Hose Barb x NPT, Male x Male, Hex - 6AFN4|6AFN4 - Grainger
Everbilt 5/8 in. Barb x 3/4 in. MHT Brass Adapter Fitting 800039 - The Home Depot
Brass Barbed Insert Fittings and Adapters
Everbilt 1/4 in. Barb x 3/8 in. MIP Brass Adapter Fitting 800019 - The Home Depot
LTWFITTING 1/4 in. x 3/8 in. I.D. Brass Hose Barb Reducer Splicer Fittings (50-Pack) HF3913R060450 - The Home Depot
Brass 6mm Hose Barb Fitting To 8mm 10mm 19mm Od Raccord Barb Reducer Barbed Adapter Pipe Fittings Gas Copper Coupler Connector - Pneumatic Parts - AliExpress
BrassCraft 3/4 in. ID x MIP Brass Hose Barb Adapter - 125-12-12X - Ferguson
JEGS 555-110846: -8 AN to Straight 3/8 in. Hose Barb Adapter Fitting | -8 AN Female to 3/8 in. I.D. Hose | Aluminum | Black Anodized Finish | Sold Individually - JEGS High Performance
12-Pack Air Hose Fittings, 1/2" Barb x 1/2" NPT Male Pipe,Fittings, Adapter, | eBay