Image is for illustration purposes only. Actual part may vary.

4387304RX

CUMMINS DOSER

This is a Cummins DEF (Diesel Exhaust Fluid) doser pump, also referred to as the Denoxtronic 2.2 dosing pump. It meters and injects DEF into the exhaust stream as part of the selective catalytic reduction (SCR) system to reduce nitrogen oxide emissions. When the pump fails—often showing symptoms like poor DEF pressure, fluid leaks, or aftertreatment fault codes—it can cause engine derate and a check engine light. Replacement restores proper DEF dosing and emission system function.