1777496 Ring-Piston Top Fits Caterpillar ModelsOne New Aftermarket Replacement Top Piston Ring for Caterpillar (Cat) Diesel Engines This top compression piston ring is a direct aftermarket replacement for Caterpillar OEM part number 1777496 (updated Cat part number 177 7496). The top ring seats in the uppermost ring groove of the piston and is a critical component for maintaining cylinder compression and controlling combustion gases in Caterpillar heavy duty diesel engines. This ring is commonly
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