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Luckyweld Air Hose Repair Kit, 2 Pack 3/8-Inch Reusable Solid Brass Hose-End Repair Fitting (3/8 Inch 2 Pcs) - Amazon.com
Amazon.com: SUNGATOR 12-Pack Air Hose Fittings, 3/8" Barb to 1/4" NPT Air Hose Repair Kit with Sealant, 3/8" Barb to 1/4" NPT Air Hose Barb Fitting, Brass Barbed Air Hose Repair Connector
Airgas - WESCR-100 - Western 1/2" Heavy Duty Ferrule Crimp Machine (For Use With 3/16", 1/4", 5/16" And 3/8" Hose)