Aqua One AR510 (Old) AR620 AR620T Powerhead*DESCRIPTION:- Aqua One AR510 (Old) AR620 AR620T Powerhead- Original Aqua One replacement Filter Pump for AquaStyle AR620, AR620T & old AR510 Aquarium. Pump has smooth finish not with indented squares.- Quiet and Efficient- Only 1 moving part- Low maintenan..