Siptenk 3/8" Brass Compression Fittings Sleeves Ferrules Inserts Nuts Fittings, 100PCS Brass Ferrule Tubing Insert Kit for DOT Air Brake Line Fittings: Amazon.com: Industrial & Scientific
Hose Ferrule Crimper for Crimping 1/4" to 3/8" Braided Hose Compressed Air Lines | eBay
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
Ferrule Crimp Assortment - Kimball Midwest
Hose Ferrule Crimper for Crimping 1/4" to 3/8" Braided Hose Compressed Air Lines | eBay
812 BRASS FERRULE 3/8 AIR HOSE
Industrial Grade 2A734 Ferrule, 3/8 in, 3 Pack of 10: Amazon.com: Industrial & Scientific