91306-ZV5-821 O-Ring (1.5X13.5) - Overview. The 91306-ZV5-821 O-Ring (1.5X13.5) is an essential rubber seal used in Honda marine engine systems. This O-ring is designed to provide a watertight and airtight seal within the fuel or mechanical assemblies, supporting the system's reliable operation. Engineered to match factory specifications, it guarantees seamless integration with existing parts, maintaining optimal performance and durability.. Key Features. Precisely sized O-Ring measuring 1.5mm t