91317-ZV5-821 O-Ring (2.0X44.5) - Overview. The 91317-ZV5-821 O-Ring (2.0X44.5) is a critical sealing component used in Honda marine engine systems. This 2.0mm thick, 44.5mm outer diameter O-ring supports the engine's water and fluid sealing processes, preventing leaks and ensuring system integrity. As a genuine Honda part, it ensures seamless integration with existing parts, maintaining optimal performance and durability.. Key Features. Precisely engineered 2.0mm thick O-ring with 44.5mm outer