Bosch Cummins 12V DEF Supply Module with Check Valve 044404229X 4387304 (Denoxtronic)Cummins 12V With Check Valve Genuine Bosch UREA (Exhaust Fluid) Supply Module OEM #'s: 4387304, 4387304RX, 0444042132, 0444042128, F00E200534 This module may also be referred to as a def pump, delivery module, urea injection pump, diesel exhaust fluid pump, dnox supply module, or denoxtronic supply module. Cut out the middle man and save money by buying direct from the Bosch distributor. Genuine Bosch 12V DEF supply module with check valve for Cummins