16708-ZW5-003 Pump Cover B - Overview. The 16708-ZW5-003 Pump Cover B is a critical component in Honda marine engine systems, supporting the water pump assembly. Its general role is to protect and enclose the water pump, ensuring it operates reliably by preventing water ingress and mechanical damage. As an OEM genuine Honda part, it guarantees precise fit and compatibility with the existing marine engine hardware, maintaining optimal performance and durability.. Key Features. Genuine OEM Pump Co