856A3111G06 is a precision aerospace component, compliant with AS9100D quality standards and FAA/EASA regulations, designed for the hydraulic systems of large commercial aircraft, as a part of the 856A3111 series hydraulic accumulator assemblies.

It acts as a hydraulic accumulator rod seal ring, forming a tight, pressure-resistant seal between the accumulator's connecting rod and cylinder end cover. This seal prevents hydraulic fluid leakage at the rod's penetration position, maintaining the accumulator's pressure storage capacity, ensuring it can steadily provide supplementary pressure for high-demand hydraulic subsystems such as flight control and brake systems, avoiding pressure drops that would reduce control response speed or system stability.

Made from oil-resistant, high-temperature and pressure-resistant fluorosilicone rubber, it operates stably at -45°C to 250°C, and resists long-term contact with aviation hydraulic fluids. Weighing 0.08kg, it allows fast MRO replacement, a key component for hydraulic accumulator performance.