15474-ZW9-000 Check Valve Spring - Overview. The 15474-ZW9-000 Check Valve Spring is a crucial component used in Honda marine engine systems, specifically designed to support the check valve system which controls the flow and sealing of fluid within the engine. This spring ensures the check valve operates correctly by maintaining the necessary tension, thereby helping to prevent leaks and sustain efficient engine performance. Crafted to meet exact factory specifications, it ensures seamless inte