91311-ZV5-821 O-Ring (1.5X3.5) - Overview. The 91311-ZV5-821 O-Ring (1.5X3.5) is a critical sealing component used in Honda marine engine systems. This O-ring supports the engine's fluid sealing system by preventing leaks and maintaining system integrity. With precise dimensions of 1.5mm inner diameter and 3.5mm outer diameter, it ensures seamless integration with existing parts, maintaining optimal performance and durability.. Key Features. Genuine Honda OEM O-Ring designed for marine engine sealing applications.. Precisely engineered to factory specifications, ensuring exact fit and function.. Maintains fluid tight seals to prevent contamination and leakage in engine systems.. Durable material resistant to marine environmental conditions, including saltwater.. Essential for preserving engine reliability and operational efficiency.. Compatible with various Honda Marine models within the marine engine series.. Why Choose Genuine OEM. Using original Honda parts like the 91311-ZV5-821 O-