5/8" x 3/8" barbed splicer. Machined Brass to ensure you get a much stronger and longer lasting product than just a cast brass.
Innovate Boost Controller Solenoid 3-Ports Mac Valve with Brass Barb Fittings
Brass Barb 1/2 Hose ID x 3/8 Hose ID Reducer Splicer Fitting Water Fuel Boat
FIVE 4mm Brass Barb Hose Fitting Straight Union Universal for Air Water Gas Oil
Reducer Hose ID 5/16” to 1/4" or 8 to 6 mm Brass Barb Y Tee Fitting #CL
5pcs 4mm Elbow 90 Degree Brass Barb Connector Fitting Joiner Barbed for Car
Reducer Hose ID 5/16” to 1/8" or 8 to 4 mm Brass Barb Tee Fitting Fuel Gas