50211-ZW9-000 Swivel Case Liner - Overview. The 50211-ZW9-000 Swivel Case Liner is a crucial component in Honda marine engine systems, supporting the swivel case assembly. This part functions as an internal lining within the swivel case area to protect moving parts from wear and damage, ensuring smooth mechanical motion and reliable water flow. Engineered as a genuine Honda OEM part, it ensures seamless integration with existing parts, maintaining optimal performance and durability.. Key Feature