Cummins 3935449 Dual Valve Cover Isolator
Cummins 3935449 Dual Valve Cover Isolator
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$35.95
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Cummins describes 3935449 as a “noise isolator,” replacing the original O-ring that came on the factory-original bolt.
This noise isolator mounts inside the valve cover (under), serves as a bolt O-ring, and helps isolate engine valve train noise from transferring through the valve cover.