91501-ZVD-300 Collar - Overview. The 91501-ZVD-300 Collar is an essential component within Honda marine engine systems. Serving primarily as a fuel tank insulator collar, it plays a vital role in securing and cushioning the fuel tank assembly, thereby reducing vibrations and preventing damage. This collar is designed to meet exact factory specifications to ensure seamless integration with existing parts, maintaining optimal performance and durability.. Key Features. Precisely engineered OEM fuel