90603-ZY6-003 Water Tube Clamp - Overview. The 90603-ZY6-003 Water Tube Clamp is an essential component within Honda marine engine systems. This clamp secures the water tube in place, ensuring proper water flow and system integrity. By maintaining the tube's position, it prevents leaks and potential damage, contributing to the overall reliability and longevity of the marine engine. Engineered to match factory specifications, it ensures seamless integration with existing parts, maintaining optima