Description
MA3I – Cummins 3685124 is a genuine OEM O-ring seal used in Cummins ISX / QSX EGR and exhaust-system sealing applications. Cummins lists the part as an O-ring seal, and aftermarket application data identifies it specifically as an EGR valve / exhaust O-ring.
PAI directly cross-references 3685124 to PAI 121424. That PAI seal is a Viton 75-durometer O-ring, AS568 size -231.
- Inside diameter: 2.609 in / 66.27 mm
- Cross-section: 0.139 in / 3.53 mm
- Approx. outside diameter: 2.887 in / 73.33 mm
- Material: Viton
- Durometer: 75
- AS568 size: -231
- Color: Black


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