Polaris 5-9-511A Concrete Cleaning Head with UltraFlexThe Caretaker Cleaning Head with UltraFlex Collar and Cap is a replacement head designed for concrete pools. The Cleaning Head disperses clean and filtered water throughout your pool to wash away dirt and debris while aiding in circulation. The Caretaker Cleaning Head comes complete with and 2-1/2" UltraFlex collar and cap for installation convenience. Available in Jet Black, this cleaning head installs quickly and its color can complement any concrete pool.