Description
MA3I – PAI 121316 is an EPDM water pump O-ring used on Cummins ISX engines. It seals the water pump to the engine block and is a direct aftermarket replacement for Cummins 3678724.
- Inside diameter: 2.598 in / 66 mm
- Cross-section: 0.118 in / 3 mm
- Approx. outside diameter: 2.834 in / 72 mm
- Material: EPDM
- Durometer: 75
- Application: Water pump to block seal


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