24834-ZW5-U21 Dual Gasket - Overview. The 24834-ZW5-U21 Dual Gasket is a crucial component within Honda marine engine systems. It acts as an effective sealing element designed to prevent leaks and ensure tight connections between engine parts, crucial for maintaining fuel and water flow integrity. With its precise OEM specifications, it guarantees seamless integration with existing components, ensuring lasting durability and consistent engine performance for marine applications.. Key Features. D