This is a Maytronics Drive Pulley TT. It is used on many Dolphin pool cleaners.
Some Dolphin models are: Advantage, Advantage Plus Pro, Deluxe, 3001, 2002, 2×2, Plus, Commander, Interactive, Enduro 11r, Heavy Duty, Pro, Pro X, Pro X2, Orion II, Supreme M4/M5, DLX6, Explorer, Deluxe 3/4/5, DX3/4, DX5/6, M3 (E55), 2×2 Gyro, Wave 50/100, Liberty, Apollo, Atlantis, Endeavor, Saturn, Nautilus, Quest, Spectra Light, Discovery, Triton, Edge, Wave 60/75, Sigma, and more. It is also designed for the Pentair Prowler 820 and 830.
