Cummins Engine Block Heater Element Vehicle Fitment: 1998.5-2021 5.9L/6.7L Cummins Equipped Diesel Vehicles Part Type: Engine Block Heater Element (Heating Unit / Freeze Plug Style) Condition: Used Manufacturer: Cummins Manufacturer Part Number: 3975628 Description: This heating element is a direct replacement for the factory block heater installed in the engine block's coolant jacket. It is a critical component for owners operating their diesel trucks in cold climates, ensuring reliable starting and minimizing engine wear. Direct Fit: Designed to install into the specific expansion plug port on the Cummins block (typically located on the passenger side), ensuring a precise and sealed fit. Note: This listing is for the Heater Element ONLY. The external Block Heater Power Cord is sold separately and is necessary for operation. Notes on Condition: Inspected for cracks, warping, or damage. May show normal cosmetic wear but is guaranteed to be functional. Gasket/seals may need to be replaced. Fitment Guarantee: Our goal is to provide you with the correct parts and fitment for your diesel truck. If this part does not fit the engine/years specified above, let us know within 14 days of you receiving the part and we will replace it!