Description
MA3H –
Cummins 3678606 is an O-ring seal used on threaded fluid fittings in Cummins engine applications. PAI’s equivalent 121366 is specified as an M27 × 2 fitting-thread O-ring, approximately 23.6 mm I.D. × 2.9 mm cross-section, made from 90-durometer Viton.
There are also ties from 3678606 to Cummins 3046943, Volvo 20866307, and PAI 121265, with the same 23.6 × 2.9 mm dimensions.


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