63102-ZW5-300 Engine Cover Seal - Overview. The 63102-ZW5-300 Engine Cover Seal is a critical OEM rubber sealing component in Honda marine engine systems. It supports the engine cover system by providing a watertight barrier that prevents water ingress, helping to protect the engine's internal components from moisture and corrosion. This seal ensures dependable engine performance and longevity by keeping the engine cover tightly sealed.. Key Features. Genuine Honda OEM part manufactured to preci