17374-ZY9-000 Muffler Grommet - Overview. The 17374-ZY9-000 Muffler Grommet is a critical rubber component designed to support Honda marine engine systems, specifically the muffler assembly. This part functions to isolate and dampen vibrations produced by the muffler, protecting the engine and exhaust components from metal-on-metal contact, excess noise, and mechanical stress. By ensuring secure mounting and cushioning, it maintains the integrity and reliability of the muffler system. Designed f