The protecting cap with code 11.01251-0048.0 is designed to shield exposed engine components or connection points on the MAN L21/31 engine from contamination, mechanical damage, and environmental influence. Commonly used during operation, maintenance, or storage, this cap helps prevent the ingress of dust, moisture, and debris. Its durable construction contributes to preserving component condition, reducing wear, and supporting safe and efficient maintenance procedures in marine and industrial settings.