The foam rings are used on the combination brush to help the cleaner climb the walls of fiberglass or some small tile pools when additional traction is needed. Pack of 4 Manufacturer Part # 6101611-R4

Fits the Following Cleaners: Dolphin Nautilus Plus Dolphin Nautilus Dolphin Triton Plus Dolphin M200 Dolphin M400 Dolphin C3 Cb Dolphin C4 Cb Dolphin Discovery Dolphin Saturn Dolphin Edge Dolphin Supreme M3 Dolphin Supreme M4 Pentair Prowler 820 Pentair Prowler 830 Dolphin Dx3 Dolphin Dx4 Dolphin Apollo Dolphin Premier