351-6100-27GSE is a precision aviation ground support equipment (GSE) component, compliant with AS9100D aerospace quality standards and FAA/EASA regulations, designed for ground maintenance of large commercial aircraft hydraulic systems.

It acts as a hydraulic pressure test coupling seal ring, forming a pressure-resistant, leak-proof seal between the GSE pressure test equipment and aircraft hydraulic system interfaces. This seal ensures accurate hydraulic pressure testing, allowing maintenance personnel to detect abnormal pressure fluctuations or hidden leaks in the hydraulic system, avoiding misjudgments that would lead to incomplete maintenance, and preventing potential hydraulic system failures during subsequent flights.

Made from oil-resistant, high-pressure resistant fluorosilicone rubber, it operates stably at -50°C to 250°C, and resists long-term contact with aviation hydraulic fluids. Weighing 0.09kg, it enables fast installation and replacement during ground operations, a critical component for hydraulic system maintenance accuracy.