21687111 | Genuine Volvo® Diesel Exhaust Fluid PumpDescription: Diesel Exhaust Fluid Pump Condition: New Brand: Volvo Part Number: 21687111 Weight: 24 lbs Fit for: Volvo, Mack Functions: Def delivery: The pump draws DEF from the DEF tank and delivers it to the SCR system. Def metering: The pump can accurately control the amount of DEF injected based on the engine's operating conditions and NOx emissions levels. Injection timing: The pump's operation is synchronized with the engine's exhaust system to