HU55067-5 is a precision-manufactured aerospace engine fuel system check valve seal, compliant with AS9100D quality standards and FAA/EASA regulations, designed for CFM56 series turbofan engines. It seals the mating surface between the check valve and its mounting seat in the engine fuel supply system, preventing reverse fuel flow and fuel leakage, which is critical for maintaining the one-way fuel delivery path, avoiding fuel backflow that may cause combustion instability, and preventing fire risks caused by fuel leakage.

Made from heat-resistant, oil-resistant fluorosilicone rubber with a reinforced metal insert, it withstands operating temperatures from -55°C to 210°C and fuel system pressures up to 5900 psi. Weighing 0.06kg with a precision-machined sealing lip, it allows for fast replacement and tightness verification during fuel system MRO overhauls. FAA Part 25 certified, it is a key component for fuel system reliability.