The Cummins 5506956RX DEF Doser Pump is a high-quality replacement part specifically designed for Cummins diesel engines. Manufactured by Cummins themselves, it guarantees a perfect fit and compatibility with the engine model. This product is a crucial component for maintaining the optimal functioning of commercial trucks, making it an essential part for any truck owner or fleet manager. Cummins 5506956RX DEF Doser Pump For Cummins Diesel Engine 4388105 5506956.