Replacement Impellers for Complete Aquatics ProficientFlow™ Asynchronous Pumps Size:Fits 2000 Pump The Skyward Fountain from Scott AL4103 x 2 AL4113 x 2 AL4161 The Skyward Fountain from Scott Aerators creates an impressive cascade of water that sounds as beautiful as it looks yet efficient 1 Watt LEDs have light output equivalent to 10 Watt halogen light and boast a 40 These replacement impeller assemblies are for the Complete Aquatics ProficientFlow™ high efficient asynchronous pumps a frequent reason for problems is mineral build up way down inside the impeller housing which causes wear and tear on the impeller and friction against the impeller which can cause overheating and intermittent operation