2M9780 Seal O Ring Fits Caterpillar ModelsOne New Aftermarket Replacement O Ring Seal for Caterpillar (Cat) 3406 Series Diesel Engines This aftermarket replacement O ring seal (2M9780 2M 9780) is designed for static sealing applications on Caterpillar 3406 series diesel engines, including injector sleeves, oil line fittings, and related fuel and lubrication system joints. Molded from nitrile rubber (NBR), it provides reliable resistance to diesel fuel, engine oil, and heat in demanding heavy
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