24821-ZY6-U11 Single Housing Plug - Overview. The 24821-ZY6-U11 Single Housing Plug is a crucial electrical connector component designed specifically for Honda marine engine systems. This single housing plug supports the marine electrical system by providing a secure and reliable connection point that is integral to the engine's rigging and accessory setup. Manufactured to Honda's OEM specifications, it ensures seamless integration with existing parts, maintaining optimal performance and durabil