19231-ZV4-020 Impeller Cover - Overview. The 19231-ZV4-020 Impeller Cover is a critical component of Honda marine engine systems. It supports the water pump system by housing and protecting the impeller, which is essential for proper engine cooling. Designed for Honda outboard engines including the BF8, BF9.9, and BF15 series, this genuine OEM part ensures seamless integration with existing parts, maintaining optimal performance and durability.. Key Features. OEM Genuine part designed specifically for Honda marine engines.. Functions to cover and protect the water pump impeller, a vital part of the engine's cooling system.. Matches factory specifications, dimensions, and tolerances to ensure perfect fit.. Contributes to efficient water flow essential for thermal regulation and engine longevity.. Integrates cleanly with adjacent hardware, gaskets, and housings without modification.. Maintains expected durability, performance, and seamless operation within the cooling system.. Why Choose