The seal ring, code 100100, is a critical sealing element within the MAN L21/31 engine, designed to prevent fluid leakage and maintain controlled pressure conditions in various mechanical and hydraulic systems. Installed at key interfaces between moving or stationary components, it provides a reliable barrier against oil, fuel, water, or air leakage while accommodating thermal expansion and operational movement. Manufactured from durable, wear-resistant, and chemically resistant materials, the seal ring maintains its sealing properties even under high pressure, vibration, and elevated temperatures. Its role in preserving sealing integrity contributes directly to operational safety, efficient engine performance, and the long-term reliability of engine assemblies.