91321-P0X-003 O-Ring (25X2.4) - Overview. The 91321-P0X-003 O-Ring (25X2.4) is a critical sealing component in Honda marine engine systems. It provides essential sealing functions that prevent leaks and ensure system reliability. Engineered to exact factory specifications, it ensures seamless integration with existing parts, maintaining optimal performance and durability.. Key Features. Precisely sized O-Ring with 25mm outer diameter and 2.4mm thickness designed for Honda marine applications.. G