PWA111411 is a precision aerospace component, compliant with AS9100D quality standards and FAA/EASA regulations, designed for the fuel systems of large commercial aircraft.

It serves as a fuel check valve seal ring, forming a tight, leak-proof seal between the valve's disc and seat. This seal ensures the one-way flow of fuel in the aircraft's fuel delivery system, preventing fuel backflow that would disrupt the stable fuel supply to the engine, avoid fuel pressure fluctuations that could cause engine power instability, or even engine flameout during flight.

Made from fuel-resistant, corrosion-resistant fluorocarbon rubber, it operates stably at -60°C to 230°C, and resists the chemical effects of aviation fuel and additives. Weighing 0.06kg, it allows fast MRO replacement, a critical component for the reliability of aircraft fuel supply.