Designed to withstand the 1800psi operating pressure of HC25 Hydraulic Rock Drills, the O’ring 86797032 addresses a common failure point of generic high-pressure seals. Generic O-rings typically burst or extrude through port gaps within 400-500 hours, but this OEM part uses high-strength NBR rubber with a reinforced molecular structure, enabling it to handle pressures up to 2000psi. Its tight dimensional control (±0.002mm) ensures it fits securely in valve and cylinder ports, maintaining a leak-free seal throughout the 800-hour replacement cycle.