NPT 1/4 x 3/8 male high pressure hose fitting

PlumbShop Brass Hose Barb Adapter, 3/8-in MIP x 3/8-in ID Hose

Products

NPT Fittings High Pressure Company

24 Feet High Pressure Braided Propane Hose Extension

U.S. Solid 304 Stainless Steel Lead Free 6000 psi High Pressure Hex Nipple, 3/4 x 3/8 NPT Male Thread Pipe Adapter(1 pc) - U.S. Solid

Fitting (3/8 NPT to -8JIC S/S), fitting

Stainless Hose Barb x Male NPT

Unique Bargains 2pcs 1/4 Barb x 3/8 NPT Male Brass Fitting Hose Adapter 6mm OD Brass Hose Fitting with 2 Clamps

U.S. Solid 304 Stainless Steel Lead Free 6000 psi High Pressure Hex Nipple, 3/4 x 1/4 NPT Male Thread Pipe Adapter(1 pc) - U.S. Solid

Boeray 2pcs 3/8 NPT Male to 1/4 Female Brass Pipe Fitting, Reducing Hex Head Bushing, Adapter Conver, Pipe Fittings - Canada