Description
MA3H – AFA A2863701 is an aftermarket O-ring seal that replaces Cummins 2863701. Cummins parts catalogs show 2863701 in ISM/QSM water-pump and accessory-drive areas, and FP Diesel lists the equivalent FP-2863701 for ISM/QSM applications.
The O-ring for A2863701 / Cummins 2863701 / PAI 121305 measures:
- Inside diameter: 3.987 in / 101.27 mm
- Cross-section thickness: 0.103 in / 2.62 mm
- Approx. outside diameter: 4.193 in / 106.51 mm
- AS568 size: -155
- Material on the PAI version: HNBR, 75 durometer, with a sky-blue Teflon coating.


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