17374-ZVT-900 Muffler Grommet - Overview. The 17374-ZVT-900 Muffler Grommet is a specialized rubber component supporting the exhaust system of Honda marine engine systems. Its primary role is to isolate and cushion the muffler, absorbing vibrations and preventing metal-to-metal contact, thereby reducing noise and increasing the durability of the exhaust system. This genuine Honda OEM part is crafted to seamlessly integrate with existing hardware and seals, maintaining optimal performance and lon