One New Aftermarket Replacement Ferrule Fits Caterpillar (Fits CAT) Industrial and Construction EquipmentThis aftermarket replacement ferrule is a precision engine component used in Fits Caterpillar (Fits CAT) industrial and construction equipment. Ferrules serve as sealing and compression fittings within engine fluid and fuel line assemblies, maintaining secure connections and preventing leaks in demanding heavy-equipment operating conditions.Compatible ModelsFits Caterpillar Engines: 3208, 3306, 3408, 3408C, 3412, 3412C, 3412D, 1673C, 1693Fits Caterpillar Construction and Industrial Equipment: 518, 589, 621R, 631C, 631E, 637D, 637E, 651E, 657E, 769C, 771C, 773B, 775B, 824B, 834B, 941, 950, 951B, 966C, 988B, 988F, 990, 992C, 992D, D10NReplaces Part Number(s):7S4433, 7S4433-AAftermarket Interchange NumbersENL80-0157New aftermarket replacement part - not remanufactured, not used.