The sealing ring H 16521 is a precision sealing element engineered to provide leak-free performance in fluid and pressure interfaces within the Sulzer ASL25 engine. Manufactured from material optimized for resistance to oil, temperature variation, and vibration, it maintains reliable elasticity and sealing efficiency over extended service intervals. By preventing leakage and protecting internal components from contamination, H 16521 contributes directly to system cleanliness, operational efficiency, and the long-term durability of critical engine assemblies.