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This aftermarket D-ring seal kit is built for Caterpillar excavator hydraulic system maintenance, including 9 commonly used sizes with 80 pieces in total. Made from premium NBR rubber, it delivers stable sealing performance for hydraulic cylinders, control valves, pumps, pipe connectors and other components, effectively stopping oil leakage and restoring normal hydraulic operation. It serves as a direct replacement for OEM part number 4C-4784 / 4C4784, ideal for on-site daily repair and replacement needs.### Specifications- OEM Part Number: 4C-4784, 4C4784- Total Quantity: 80 pieces- Size Variants: 9 commonly used sizes for Caterpillar excavator hydraulic systems- Material: High-grade NBR (Nitrile Butadiene Rubber)- Working Temperature Range: -30°C to 120°C- Application: Hydraulic cylinders, main control valves, hydraulic pumps, pipeline joints and other sealing positions### Package Includes1 set of 80Pcs D-ring seal kit (9 sizes in total)### Key Features1. Premium NBR material with excellent oil resistance, wear resistance and aging resistance, adapted to long-term heavy-duty hydraulic working conditions2. 9 standard sizes with 80 pieces, covering most daily sealing repair demands for Caterpillar excavators3. Precision-molded dimensions, perfectly matched with original groove specifications, direct drop-in installation without modification4. Wide compatibility with Caterpillar excavator hydraulic circuits, suitable for boom / stick / bucket cylinders, main valves, hydraulic pumps and pipeline connections### FitmentCompatible with most Caterpillar excavator models with matching hydraulic sealing specifications, including but not limited to 320B, 320C, 320D, 325B, 325C, 325D, 330B, 330C, 330D, 336D, 345B, 345C, 349D series.Note: Please confirm the required size and part number before purchase to ensure compatibility.### After Sales Service- 14-day free return and exchange for unused items in original condition- 3-month quality warranty against manufacturing defects- Fast shipping from US warehouse
