The O-ring designated as code number K 73136 plays a crucial sealing role in the Sulzer ZV40/48 diesel engine, specifically as a gasket for cover K 73118. This seemingly simple but essential rubber component is designed to withstand pressure, temperature fluctuations, and chemical exposure typical of marine and industrial environments. It ensures a tight seal, preventing leaks and maintaining system integrity. A high-quality O-ring like this is vital for protecting internal engine components and ensuring efficient operation over long service intervals.