5J4989 Seal Assy Fits Caterpillar 3J4441 3056E 3306 3406 3406B 3406C 3408 3408COne New Aftermarket Replacement Hydraulic Piston Seal Assembly Fits Caterpillar (Fits CAT) Engines and Equipment This hydraulic cylinder piston seal assembly (seal assy) provides a leak tight seal between the hydraulic piston and cylinder bore, maintaining pressure containment and reliable cylinder performance. Constructed as a 2 piece piston seal in PTFE with a Buna N expander, it is a direct aftermarket replacement Fits Caterpillar (Fits CAT) OEM
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