19289-ZY6-000 Water Joint Cap - Overview. The 19289-ZY6-000 Water Joint Cap is an essential component in Honda marine engine systems. This part plays a crucial role in sealing the water joint within the engine's cooling system, preventing leaks and ensuring proper water flow. Designed to meet factory specifications, it supports the engine's optimal cooling performance, thereby contributing to the longevity and reliability of your marine equipment. Manufactured as a genuine OEM Honda part, it ens