15121-ZW5-000 Oil Pump Cover - Overview. The 15121-ZW5-000 Oil Pump Cover is a critical component within Honda marine engine systems. It serves to seal and protect the oil pump assembly, ensuring proper lubrication and preventing leaks in the oil circulation system. This cover supports the oil pump system's ability to maintain seamless engine performance and reliability. Carefully designed to integrate seamlessly with existing parts, it maintains optimal performance and durability.. Key Features