2015-16. DIESEL. EMISSIONS REDUCTION SYSTEM. Injector retainer clip. A Clip which helps secure the Diesel Exhaust Fluid Injector to it's mounting point. A component that facilitates the mounting of the Diesel Exhaust Fluid Injector. A part which fits around the Diesel Exhaust Fluid Injector, thereby securing the component in place with a clamping force. Emissions (DEF) Bracket. Emissions (DEF) Clamp. retainer. Included with: Injector.