●Replacement Ultra-Fine Filter Panels (4 pk) ●Compatible with: Active 10, Active 15, Advantage, Cayman, E10, Echo, Encore, Escape, Explorer E20, Nautilus CC, Proteus DX3, Prowler 910, Prowler 917, S100, S50, Solo, T15, T25, Warrior SL. ●This part is not compatible with the Nautilus (old), Nautilus CC Pro, Nautilus CC Supreme. ●Maytronics Certified Genuine Parts; Keep your Dolphin pool cleaner in top condition