Part number lookup
3966721 Replacement Parts
Cross-reference and compare 1 replacement listing for OEM / aftermarket part number 3966721. Use this part-number page — not a generic equipment or brand hub — to review price, availability, and fitment before ordering.
1 Matching Product
Part Numbers and Cross References
Applications and Fitment Summary
- Part Number
- Cummins Engine 6CT ISC ISL QSL 6L
- Cummins · s:CUMMINS Content: Piston: 1 set Piston Ring:1 set Piston Pin:1 set Piston Snap:1 set
Frequently Asked Questions
What parts replace OEM number 3966721?
This page lists 1 replacement listing indexed under 3966721. Compare cross references, applications, and pricing before ordering.
How do I confirm fitment for 3966721?
Match the stamped part number first, then verify machine model, engine code, serial number, mounting points, and photos of your old part before checkout.
Can I request a quote if 3966721 is not an exact match?
Yes. Use the fitment inquiry form with your machine plate, engine model, and photos. Support can review alternatives or cross references.