The Seal Kit 86726734 provides a comprehensive sealing solution for HC25 Hydraulic Rock Drills, including all necessary seals for cylinders, valves, and pistons. Generic seal kits often omit critical seals or use low-quality rubber that fails early, leading to multiple leaks. This OEM kit includes high-performance nitrile rubber seals with anti-aging additives, designed to withstand -30℃ to 120℃ and maintain elasticity over 800 hours. It simplifies maintenance by providing all required seals in one package, ensuring full system sealing until mandatory replacement.