6.7 LITER. EMISSION REDUCTION. Reservoir retainer ring. A clip which helps secure the diesel exhaust fluid tank to its mounting point. A component which locks and holds the Diesel Exhaust Fluid Pump in place. LOCK. Diesel Emissions Fluid (DEF) Tank Clip. Diesel Exhaust Fluid (DEF) Pump Lock. Reservoir retainer. Wire. Included with: Reservoir tank.