Maytronics Dolphin Climbing Brush, ,Blue,w o Rings, [Qty 2] (6101660 R2) outdoor while the swirl twin roto while the swirl twin roto format makes it especially practical in assemblies where a more dynamic and distinctive output is part of the intended design A 3 pole contactor helps control electrical loads in compatible equipment by opening and closing the power circuit as needed Brush condition is a major factor in how well a robotic cleaner can maintain traction and perform wall or surface climbing The without rings configuration also keeps the part matched to the intended assembly style for the original cleaner platform