John Deere RE556781 Reservoir Dosing Unit Pump is a Diesel Exhaust Fluid (DEF) dosing pump that draws DEF from its reservoir and meters it into the dosing line. This unit is supplied with the RE566558 DEF line to complete the dosing circuit. Designed for John Deere equipment that uses a DEF dosing system, it delivers the DEF flow required for exhaust aftertreatment.
