856A3111G07 is a precision aerospace component, compliant with AS9100D quality standards and FAA/EASA regulations, designed for the hydraulic systems of large commercial aircraft.

It acts as a hydraulic accumulator seal ring, forming a pressure-stable, airtight seal between the accumulator's piston and cylinder body. This seal ensures the accumulator can store and release hydraulic pressure stably, providing supplementary pressure support for peak-demand hydraulic subsystems including flight control and brake systems, avoiding pressure fluctuations that would reduce control precision, or sudden pressure loss that would threaten flight safety.

Made from oil-resistant, high-pressure and high-temperature resistant fluorosilicone rubber, it operates stably at -45°C to 250°C, and resists long-term contact with aviation hydraulic fluids. Weighing 0.09kg, it enables fast MRO replacement, a critical component for hydraulic system pressure stability.