The flexible coupling, code P51005-03, plays a crucial role in the MAN L21/31 engine drivetrain by compensating for misalignment and absorbing vibrations between rotating components such as the engine and generator or shaft. Constructed from resilient materials and designed for torsional flexibility, it ensures smooth power transmission while protecting connected equipment from mechanical stress. Its use enhances operational safety, extends the lifespan of adjacent components, and supports efficient performance under demanding marine and industrial conditions.