This Maytronics 9991432-R4 Ultra Fine Cartridge Filter Panel 4 per Pack for use with M400, M500, Wave 65, Wave 90, Triton Plus, Oasis Z5, M200, Nautilus Plus, Nautilus CC Plus is a reliable replacement part, designed to seamlessly intergrate with the original pool cleaning system. The catridge filter panel houses the cartridge safely and securely. Maytronics pool cleaners help keep your pool healthy and clean, which is of the utmost importance. Ensure that your pool cleaner is running as cleanly as possible with this certified genuine part.