90604-Zw5-020 Tube (D15) Clamp - Overview. The 90604-ZW5-020 Tube (D15) Clamp is an essential component in Honda marine engine systems. It is engineered to provide secure and reliable mounting for the D15 tube, commonly involved in fuel or cooling line systems. Installed within the rigging and accessories system, this clamp ensures seamless integration with existing parts, maintaining optimal performance and durability.. Key Features. Genuine OEM Honda clamp designed specifically for the D15 tub