This 6101311-R1 Rear Brush for use with Dolphin S200/S300/S300i automatic pool cleaners. Designed for 21st-century pool owners, our smartest, most advanced robotic pool cleaners is here to deliver a whole new level of pool cleaning performance. Each Dolphin model is masterfully crafted to provide incomparable pool scrubbing and cleaning, with a cutting-edge water filtration system, and the best warranty on the market.