The Lip Seal 86715554 is designed for high-pressure rotating shaft sealing in HC25 Hydraulic Rock Drills, a demanding application where generic seals often fail. Generic lip seals use low-quality rubber that wears out within 500-600 hours under 1800psi pressure, leading to oil leakage. This OEM lip seal features a polyurethane lip with a reinforced spring-loaded design that maintains constant contact with the shaft, even as the lip wears. Its wear resistance is 60% higher than generic seals, and it can withstand pressures up to 2000psi, ensuring a leak-free seal over 800 hours of continuous rotation.