2377623 Seal O Ring Fits Caterpillar ModelsOne New Aftermarket Replacement Seal O Ring for Caterpillar (Cat) 3500 Series Engines and Heavy Equipment This aftermarket replacement O ring (part number 2377623 237 7623) is a precision fit fluorocarbon rubber (FKM) engine seal used in Caterpillar 3500 series diesel and gas engines. It seals oil filler, filter, valve mechanism, torque converter cooler, and related connections across a wide range of Cat engine powered machines including off highway
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