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This Maytronics Ultra Fine Filter Cartridge is a replacement part for select Dolphin robotic pool cleaners.
The 9991425-R4 filter is compatible with the following cleaner models only: Dolphin DLX 4*, DLX 5*, DX 6*, Edge, Premier, Quest, Triton, Wave 75, Discovery*, Nautilus and Prowler 820/830. Models denoted with an asterisk require the Maytronics Dolphin Conversion Kit, part # 9991414-R1 in order to be used