Description
MA3H –
PAI 121390 is a rectangular fuel-system sealing ring used in select Cummins fuel-pump and fuel-pump-damper assemblies. Cummins QuickServe data places 139988 directly in the Celect fuel-pump assembly beside the fuel-pump damper head, cover and diaphragm. FP Diesel independently identifies FP-139988 specifically as a fuel pump damper rectangular ring on L10/M11 applications.
Verified PAI specifications:
- Inside diameter: 1.484 in / 37.693 mm
- Cross section: 0.134 in / 3.403 mm
- Thickness: 0.134 in / 3.403 mm
- Material: Viton
- Durometer: 75
- Identification: Orange OD
- Series: -222S
Crosses
121390, 139988, M-139988, M139988, FP-139988, FP139988, K139988, D139988


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