Description
MA3H –
PAI 121299 is a Teflon-coated EPDM O-ring used across several Cummins heavy-duty engine applications, including L10, M11, ISM, and also appearing in PAI X15 upper gasket kits. PAI identifies Cummins 3102802 as the primary OEM reference.
Published specs are approximately 2.362 in / 59.99 mm inside diameter with a 0.103 in / 2.62 mm cross-section, 70-durometer EPDM, AS568 size -142.


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