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24V Urea Adblue Dosing Pump OE 4387658 for Heavy Duty Truck. Stable Urea Spraying Function: Accurately control AdBlue injection volume, effectively reduce urea crystallization and avoid SCR system failure during long-distance truck driving. Anti-Leak & Alarm Free Design: Solve common issues like liquid leakage, blockage and engine fault light alert caused by worn original urea pumps, keep your truck emission system running normally. 1:1 OEM Original Matching: Fully consistent with OE part 4387658, production tolerance controlled within 0.02mm, plug-and-play without modification, 30% longer service life than generic aftermarket.