The seal ring with code 06.56190-0739-1.0 is a precision sealing element used throughout the MAN L21/31 engine to protect critical systems from fluid leakage and pressure loss. Designed to withstand aggressive temperatures, pressure fluctuations, and chemical exposure, this ring provides long-term elastic sealing performance in lubricating oil, fuel, and cooling circuits. Its reliability is essential for preserving system cleanliness, reducing wear, and ensuring continuous, trouble-free engine operation in demanding marine and industrial environments.