91351-ZY3-003 O-Ring (105X3.1) - Overview. The 91351-ZY3-003 O-Ring (105X3.1) is a critical sealing component within Honda marine engine systems. This specially sized O-ring supports the sealing system to prevent water, oil, or air leaks that could compromise engine performance. Engineered to exact Honda specifications, it ensures seamless integration with existing parts, maintaining optimal performance and durability.. Key Features. Genuine OEM Honda O-Ring with dimensions 105mm outer diameter