MettleAir 129-6-4 3/8" ID x 1/4" ID Reducer Barb Mender/Splicer/Joiner/Union Fitting Brass Tubing Hose Adapter/Coupler Part # : 129-6-4 Hose ID 1 (Left) : 3/8" Hose ID 2 (Right) : 1/4" Material : Brass Type : Barb Hose Mender/Splicer Reducer