HU55119-3 is a precision-manufactured aerospace engine fuel system seal component, compliant with AS9100D quality standards and FAA/EASA regulations, designed for large commercial turbofan engines. It seals the connection between the engine fuel injector and the combustion chamber interface, preventing aviation fuel leakage before it enters the combustion chamber, which is critical for maintaining the accuracy of fuel injection volume and pressure, ensuring sufficient and stable combustion of the fuel-air mixture, and avoiding fire risks caused by fuel leakage in the hot section of the engine.

Made from high-strength, fuel-resistant and high-temperature-resistant fluoropolymer composite, it withstands operating temperatures up to 200°C and long-term contact with aviation fuel. Weighing 0.041kg with a precision-machined sealing surface, it allows for fast installation and tightness verification during fuel system MRO overhauls. FAA Part 25 certified, it is a key component for engine fuel system safety.