16950-ZVB-003 Petcock Assembly (2Way) - Overview. The 16950-ZVB-003 Petcock Assembly (2Way) is an essential component in Honda marine engine systems. It functions as a fuel shut-off valve that controls the flow of gasoline to the carburetor, providing reliable fuel management for optimal engine performance. Manufactured to precise OEM specifications, it ensures seamless integration with existing parts, maintaining optimal performance and durability.. Key Features. OEM genuine Honda 2-way petcock