14721-ZW6-000 Exhaust Valve - Overview. The 14721-ZW6-000 Exhaust Valve is an essential part of the Honda marine engine system, responsible for regulating the exhaust gases exiting the engine's combustion chamber. This valve plays a critical role in maintaining efficient engine performance and durability within Honda marine engines. Engineered to exact factory specifications, it ensures seamless integration with existing parts, maintaining optimal performance and durability.. Key Features. Genuine OEM Honda Exhaust Valve.. Precisely controls exhaust gas flow from the combustion chamber.. Designed to match factory specifications, dimensions, and tolerances.. Seamlessly integrates with existing hardware and engine components.. Enhances engine performance and longevity by maintaining effective exhaust flow.. Manufactured to meet Honda's stringent quality standards ensuring durability.. Why Choose Genuine OEM. Using original Honda parts like the 14721-ZW6-000 Exhaust Valve preserves the in