Keep your Dolphin pool cleaner in top condition with the replacement Rough Filter Insert S2. The Maytronics certified genuine part is compatible with Dolphin ADVANTAGE ULTRA, Dolphin S200, Dolphin Quantum, Dolphin Active 20, Dolphin ADVANTAGE PRO, Dolphin Proteus DX4, Dolphin Triton PS, Dolphin Proteus DX5i, Dolphin Triton PS Plus, Dolphin S300, Dolphin Active 30, Dolphin T35, Dolphin Explorer E30, Dolphin T45, Dolphin T55i, Dolphin S400, Dolphin Active 40, Dolphin Explorer E50, Dolphin M600, Dolphin Active 60, and Dolphin Explorer E70.