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Cummins · Hardware & Fasteners
3949781CUM
In stock · ships from Knoxville
This is a Cummins quad ring seal, a square-profile O-ring used to create a leak-proof joint between engine components such as oil lines, filter housings, or injector tubes.
Confirm the part fits before you buy. Applications and interchange numbers are researched and audited per part.
We don't publish fitment for this part yet. Rather than guess, get it confirmed against your truck in under a minute.
Over time, seals harden and crack, causing oil or coolant leaks; they are replaced during routine maintenance or component repair to ensure proper sealing.
Part Number: 3949781CUM
SEAL
Vendor: MHC Kenworth
Dealer: KP Services Crossville
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