50214-ZV4-003 Swivel Case Bush - Overview. The 50214-ZV4-003 Swivel Case Bush is a critical component in Honda marine engine systems, specifically supporting the steering system by providing a wear-resistant surface for the swivel case's pivoting action. This bush is engineered to facilitate smooth and controlled swivel motion, ensuring reliable handling and operation of your marine engine's steering mechanism. Designed for seamless integration with existing hardware, seals, and housings, it mai