10pcs Brass Double Taper Ferrule 3 4 5 6 8 10mm OD Compression Sleeve Seal Retainer Ring Fittings Tube Centralized Lubrication
https://www.vogueparade.com/shopping/EN/200282142/1/32998555444/10pcs-brass-double-taper-ferrule-3-4-5-6-8-10mm-od-compression-sleeve-seal-retainer-ring-fittings-tube-centralized-lubrication//