The sleeve identified by code number H 21415 plays a vital role in the cooling system of the Sulzer ASL25 diesel engine. Specifically designed to direct and contain cooling water flow, this component ensures efficient heat dissipation from engine parts that operate under high thermal stress. Made from corrosion-resistant materials, the sleeve supports long-term durability and reliable operation in demanding marine and industrial environments. A properly maintained sleeve contributes to engine efficiency and prevents overheating, making it essential for sustaining overall system health.