91302-028-000 O-Ring (15X2.5) - Overview. The 91302-028-000 O-Ring (15X2.5) is a critical sealing component used in Honda marine engine systems. This O-ring supports the engine's fluid sealing systems, effectively preventing leaks of liquids or gases within the system. Manufactured to precise OEM specifications with an outer diameter of 15mm and thickness of 2.5mm, it ensures seamless integration with existing parts, maintaining optimal performance and durability.. Key Features. Precise 15mm out