Zodiac MX8 Suction-Side Cleaner Cyclonic Vacuum technology ensures the MX8 captures maximum debris whilst maintaining maximum cleaning power  connects directly to skimmer or dedicated 1.5 vacuum line X-Drive technology provides advanced dual navigation for best pool coverage with no hang ups. Thoroughly cleans floor, walls, and waterline of any size or shape pool. X-Trax tires provide extreme maneuverability and climbing performance, even in tight corners and on vertical walls Ultra-efficient power source provides maximum torque while operating at low flow, not burdening the pool system  compatible with variable-speed pumps Operates in all in-ground pools. Best choice for solar, 2-speed, and variable-speed pumps.Pool Surface(s)-Concrete, Tile, Vinyl and Fiberglass. The flow regulator valve is designed to consistently limit high flow of water through the cleaner. When flow is correct, the cleaner components are less susceptible to damage and the life of the cleaner can be extended. By checking for proper wheel rotation timing, you can verify the cleaner is operating at maximum efficiency