50107-Zvd-000 Stopper Collar - Overview. The 50107-ZVD-000 Stopper Collar is a small yet essential component in Honda marine engine systems. It functions primarily as a stop or retainer to restrict movement of specific parts within the engine assembly. This collar ensures that components remain securely in place during operation, thus preserving mechanical integrity and dependable performance. Engineered to fit precisely within Honda marine setups, it ensures seamless integration with existing p