Description
MA3I – PAI 321231 is a heavy-duty fitting O-ring seal manufactured as a direct replacement for Caterpillar 3D2824. PAI’s own Caterpillar engine-kit documentation directly pairs 321231 → 3D2824, including use in 3116-series service kits and 3406E/C15 compressor kits
- Inside diameter: 0.924 in / 23.47 mm
- Cross section: 0.116 in / 2.95 mm
- Outside diameter: about 1.156 in
- Material: Buna-N / Nitrile
- Durometer: 90A
- AS568 size: -912


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