Replacement filter panels works with the following Dolphin Robotic Pool Cleaners: S200/300/300i, Active 20/30/30i, T35/45/55i, M600, Triton PS/PS Plus, Proteus DX4/DX5i, Discovery, Mercury
Also works with: Quantum, Premium, Prowler 920/930, Warrior SE/SI.
Maytronics part number: 9991467-R4
Maytronics Certified Genuine Parts. Keep your Dolphin pool cleaner in it's best condition.