Ferrule for 3/8″ Rubber Hose (7329) - Tire Supply Network
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
101425-F Brass Hose Ferrule 3/8" Low Pressure Breathing Air Hose 250PSI | High Pressure Breathing Air Compressors | Breathing Air Systems, Inc.
Amazon.com: AES Industries AES 855 Heavy Duty Air Hose Ferrule Crimping Tool with 5 Dies (1/4" Single Braid thru 3/8" Double Braid Hose) : Automotive
Hose Ferrule Crimper for Crimping 1/4" to 3/8" Braided Hose Compressed Air Lines | eBay
Amazon.com: SUNGATOR 1/4" NPT to 3/8" Barb Hose Barb Fittings, Brass Air Hose Barb Fittings, 3/8" Barb to 1/4" NPT Male Thread Hose Barb Adapter Connector, Barbed Air Hose Repair Fitting Kit