91354-ZY1-871 O-Ring (2.4X27.7) - Overview. The 91354-ZY1-871 O-Ring (2.4X27.7) is a vital sealing component used in Honda marine engine systems. This O-ring is instrumental in ensuring tight seals within fuel or hydraulic systems, preventing leakage and maintaining system integrity during operation. Its precise 2.4mm inner diameter and 27.7mm outer diameter dimensions conform fully to Honda's factory specifications, which allows seamless integration with existing parts, maintaining optimal perf