The seal ring M20x26, code 06.56190-0715-1.0, is a critical sealing component used in fluid systems of the MAN L21/31 engine. Designed to provide leak-tight connections at threaded or bolted interfaces, it prevents the escape of lubricating oil, cooling water, or fuel under pressure. Its precisely defined dimensions ensure optimal compression and sealing efficiency, while its material composition resists temperature fluctuations, chemical exposure, and mechanical stress. Reliable sealing is essential for maintaining system pressure, preventing contamination, and ensuring efficient and safe engine operation.