91355-ZW4-H11 O-Ring (1.8X10.8) - Overview. The 91355-ZW4-H11 O-Ring (1.8X10.8) is a critical sealing component used in Honda marine engine systems. This O-ring supports the fuel and cooling systems by providing a precise and reliable seal that prevents leaks and maintains system pressure integrity. Its dimensions of 1.8mm thickness and 10.8mm outer diameter ensure exact fitment for specific marine applications, promoting optimal engine performance and longevity. Designed according to Honda fact