Image is for illustration purposes only. Actual part may vary.

4934279CUM

WASHER SEAL

The Cummins 4934279CUM is a sealing washer intended to create a leak-proof connection at bolts, plugs, or fittings on heavy-duty diesel engines. Typically made of a soft metal such as copper or aluminum, it deforms under torque to fill surface imperfections and prevent fluid or gas escape. This washer should be replaced whenever the mating component is serviced—common applications include oil drain plugs, fuel line connections, and high‑pressure oil passage plugs. While often associated with Cummins ISX engines, its precise use should be verified using the appropriate Cummins parts diagram for your engine model.