Your cart is empty
Browse our catalog to find the parts you need.
These images are illustrative and may not match the product exactly. Always verify by part number — or confirm instantly with the assistant using a photo or VIN.
MHC Kenworth · Engine
3970404
In stock · ships from Knoxville
This is a plain (non-reinforced) hose used in the air or water systems on Cummins B, ISB, and C Series engines.
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.
It typically serves as a connecting tube for coolant transfer, air intake, or other low-pressure fluid routing on the engine. You replace it when the original hose becomes brittle, cracked, or swollen from age and heat cycles, which can lead to leaks, overheating, or loss of air pressure on related components.
Part Number: 3970404
HOSE PLAIN
Vendor: MHC Kenworth
Dealer: KP Services Crossville
Compatibility, alternatives, and more
