91308-MJ0-003 O-Ring - Overview. The 91308-MJ0-003 O-Ring is an essential sealing component used in Honda marine engine systems. This durable rubber seal plays a vital role in preventing leaks and maintaining the integrity of various engine components within the marine system. Designed to fit precisely according to Honda's strict factory specifications, the O-Ring ensures seamless integration with existing parts, maintaining optimal performance and durability.. Key Features. Precise rubber O-Rin