Engel Coolers Hanging Accessory Tray for UC Cooler/Dry Box Engel hanging plastic tray - is now available as a replacement part. This tray ships standard in all Engel Cooler/Dry Boxes with part number prefix "UC". It is designed to hang on a special lip at the top of the cooler base. It can be slid from one side to the other for easy access into your cooler.