16950-ZVD-003 Petcock (Three-Way) - Overview. The 16950-ZVD-003 Petcock (Three-Way) is an essential component in Honda marine engine fuel systems. This three-way petcock valve allows precise control of fuel flow, supporting seamless switching between multiple fuel sources or tank positions. Engineered to Honda's exact factory specifications, this part ensures reliable operation and robust integration with existing hardware, maintaining optimal fuel delivery efficiency and system durability.. Key