DEF Doser Urea Pump Assembly for Cummins Diesel Engine 5506956RX 4388105 5506956. High-quality material, good corrosion protection and best durability. Easy to install, direct fits. Interchange Part Number: 2115624PE, 2208766PE, 4388105, 5506956, 5506956CUM, A052Y, A06X234, 2115624, 2208766, 5506956RX. For Cummins 5506956, 4388105 DEF Doser Pump. 1 DEF Doser Pump. Please make sure it will fit your machine before purchasing it. Excluding installation instructions, it is recommended to use professional installation. Parts that are modified in any way or damaged as result of improper installation will not approved for return. Please note that communication received during the weekend may experience a delay in response.