Keep your Dolphin pool cleaner in top condition with the replacement Dolphin Motor Unit. The certified Maytronics part is compatible with Dolphin ADVANTAGE PRO, Dolphin Premium, Dolphin Proteus DX5i, Dolphin Triton PS Plus, Dolphin S300, Dolphin Active 30, Dolphin T45, Dolphin T55i, Dolphin S400, Dolphin Active 40, and Dolphin Explorer E50 Cleaners.