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Genuine Cummins / Jacobs Engine Brake Assembly.
Part Number: 3963797
Jacobs Model: 490A
Description: Rear Engine Brake Assembly
Voltage: 24VDC
Condition: New Old Stock (NOS) – never installed.
Original Jacobs/Cummins part in original box. Box may show signs of shelf/storage wear from age.
Please verify part number 3963797 and compatibility with your engine/CPL before purchasing.
You will receive the exact part shown in the photos.
