50201-ZVL-900ZB Swivel NH565 Case - Overview. The 50201-ZVL-900ZB Swivel NH565 Case is a critical component designed for Honda marine engine systems, specifically supporting the steering and linkage system. It plays an essential role in ensuring smooth mechanical motion and effective hydraulic or mechanical steering control, providing durability and reliable operation on your marine vessel. Constructed to OEM factory specifications, this swivel case ensures seamless integration with existing par