Maytronics 99919117 Bottom Lid AssemblyThe Maytronics 99919117 is a Bottom Lid Assembly designed for the Dolphin Deluxe Series robotic pool cleaners. It includes support rails and is an essential component for securing the filter bag or cartridge, maintaining a tight seal to ensure efficient water flow through the filtration system. This assembly is compatible with models such as Deluxe 4, Deluxe 5, DX5, DX6, Triton Edge, Discovery, Wave 75, Nautilus Premier, and Quest.