91301-216-000 O-Ring (5.5X1.5) - Overview. The 91301-216-000 O-Ring (5.5X1.5) is a vital sealing component for Honda marine engine systems. This high-quality rubber O-ring, with an outer diameter of 5.5mm and a thickness of 1.5mm, functions to seal joints and prevent fluid leaks, which is essential for maintaining reliable engine operation and system integrity. Manufactured to exact Honda factory specifications, this part ensures seamless integration with existing parts, maintaining optimal perf