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