This Maytronics Dolphin 9980731 Cartridge Locking Hooks for use with Supreme M4 and M5, Liberty, Wave 65, Wave 90, Bio Pvc, C3, C4, M400, Triton Plus, Dyn Oasis Z5, Dyn C3 is a reliable replacement part, designed to seamlessly intergrate with the original pool cleaning system. The locking hooks securely hold the cartridge in the pool cleaner, ensuring proper operation. 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.