IWP 0280 series injectors, such as IWP063 IWP043 IWP162 IWP181 IWP182 IWP189 IWP063 IWP069 0280158233 0280158091 0280158020. Fluorine Rubber. Our fuel injector O-rings are made of fluorine rubber, a material that boasts high temperature resistance, oxidation resistance, oil resistance, corrosion resistance, and anti-aging properties, all of which ensure excellent sealing performance and long service life.