23172-ZW1-003 Mount Case Gasket - Overview. The 23172-ZW1-003 Mount Case Gasket is an essential component in Honda marine engine systems. This gasket is specifically designed to seal the mount case, preventing oil leaks and maintaining proper engine compression. It plays a critical role in ensuring reliable operation and durability of the engine by protecting the internal components against contamination and wear. Designed to exact factory specifications, it ensures seamless integration with exi