91310-PH7-000 O-Ring (19.8X2.4) - Overview. The 91310-PH7-000 O-Ring (19.8X2.4) is a precision sealing component specifically designed for Honda marine engine systems. This O-ring plays a crucial role in preventing fluid leaks and maintaining pressure integrity within the engine's fuel or oil systems. Engineered to match factory specifications, it ensures seamless integration with existing parts, maintaining optimal performance and durability.. Key Features. High-quality O-Ring with dimensions 1