The seal N 71091 is a critical sealing element used in the Sulzer ASL25 engine to prevent leakage of fluids and protect internal systems from contamination. Designed to maintain reliable sealing performance under fluctuating pressures, temperature variations, and continuous vibration, this seal ensures stable operation throughout extended service intervals. Its application-optimized material and precise manufacturing support long service life, safeguard adjacent components, and contribute directly to the cleanliness, efficiency, and safety of the engine’s fluid systems.