Pentair 360040 Kreepy Krauly Suction-Side Inground Pool Cleaner, Concrete/Gunite Only (Flat Seal) Dive float directional system helps guide cleaner throughout entire pool from the water line to the pool bottom for great cleaning coverage Automatic valve automatically regulates water flow to set the ideal travel speed for more thorough cleaning Roller strap maneuvers cleaner around steps and ladders for uninhibited cleaning Cleaner wings help channel leaves, dirt and debris directly into filtration system Original "one moving part" design for years of dependable service - no wheels or gears to replace