56170-ZVP-003 Manual Valve - Overview. The 56170-ZVP-003 Manual Valve is an essential control component for Honda marine engine systems, specifically tailored for manual operation or regulation of fluid flow within the marine system. As a critical part of the fuel or hydraulic system, it ensures smooth and reliable control to maintain engine performance and safety. Crafted to meet precise factory specifications, this OEM manual valve guarantees exact fit, function, and durability for seamless in