... 3.Yellow zinc-plated. White zinc-plated Name:Hydraulic Hose FerruleMaterial:Carbon Steel, Stainless Steel, Brass,alloy steel etc ... gas etc;Our main products are Ferrule, Hydraulic fittings, Hydraulic hose fittings, Hydraulic adapter, Hydrualic connections, hydraulic 3-piece suit, ... 1) Ferrule, matched with many kinds of pipes such as SAE, DIN, EN, GB etc2) Metric Fitting Flat Seal Fitting, Mulit ...