Neptune Systems COR-20 Intelligent Return PumpUse With or Without an Apex Controller! The intelligent Neptune COR 20 Return Pump is easily the smartest pump available. Directly connecting to any Apex controller through an Aquabus Port, but if you do not have a controller, don't worry, you don't need one! COR pumps come standard with advanced control features that can be found by using the Apex Fusion Cloud Software (Apex required). Add a COR pump to your system today to see the difference. IQ