17394-ZV5-000 Muffler Cover Gskt - Overview. The 17394-ZV5-000 Muffler Cover Gskt is a critical sealing component used within Honda marine engine systems. Its role is to provide a reliable, watertight seal between the muffler and its cover, effectively preventing exhaust and water leaks that could compromise engine performance and safety. Designed to fit perfectly with the muffler assembly on Honda outboard engines, this gasket ensures seamless integration with existing parts, maintaining optima