23172-ZY6-000 Mount Case Gasket - Overview. The 23172-ZY6-000 Mount Case Gasket is a vital sealing component within Honda marine engine systems. It plays a critical role in protecting the engine's mounting case by preventing leaks and ensuring a secure seal between joined parts. Designed specifically for precision and reliability, it ensures seamless integration with existing parts, maintaining optimal performance and durability.. Key Features. Genuine OEM gasket manufactured to Honda's exact fa