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MHC Kenworth · Hardware & Fasteners
3957131CUM
In stock · ships from Knoxville
This is a genuine Cummins O-ring seal, part number 3957131. It's a small circular sealing component used to create a leak-proof connection between two mating surfaces on a diesel engine—commonly in oil, fuel, or coolant systems.
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.
You would replace this seal whenever you notice fluid leaking from a connection, during a repair or overhaul of the related component, or as part of a preventive maintenance service to avoid future leaks.
Part Number: 3957131CUM
SEAL
Vendor: MHC Kenworth
Dealer: KP Services Crossville
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