Neptune Systems COR 20 Return Pump – Silent, Smart, and Apex-Ready   The  COR-20 Return Pump built by Neptune Systems is designed to deliver precision flow, smart control, and silent performance. Whether you're running a high-tech reef system or just need a reliable return pump, the COR-20 gives you both power and peace of mind. Smart Operation of the Neptune Systems COR 20 – With or Without Apex No Apex? No problem. You can run the COR-20 Pump on its own right out of the box. In standalone mode, you’ll still have access to basic pump functions like speed control. But if you do have an Apex Controller, plug the COR-20 into an open Aquabus port and you instantly unlock advanced features through Apex Fusion—including cloud-based control, automation, and real-time monitoring. Advanced Control with Apex Fusion COR-20 submersible pump was made with control in mind from the ground up. Once connected to Apex, it takes just a few clicks to set flow rates, program feed modes, or track performance data. The system lets you monitor flow, temperature, and power draw in real time—and even set alerts if something strays from your set limits. Features include: Flow rate adjustments Real-time feedback and status Feed mode programming Min/max flow restrictions using IQ-Level Technology Auto slowdown on temperature spikes Powerful, Flexible Flow of the Neptune Systems COR 20 Return Pump – Up to 2000 GPH The COR-20 pushes up to 2,000 gallons per hour and includes multiple output fittings to suit your setup. Whether you're plumbing with 1.25", 1.0", or 0.75" PVC, the COR-20 adapts easily. Suggested configuration: use the 1.25" BSPP union for maximum flow efficiency, but the smaller fittings work perfectly if your plumbing requires it. Whisper-Quiet, Energy-Efficient Performance This pump uses advanced BLDC motor tech with vector control to deliver high performance without the racket. At full power, it draws less than 50 watts and produces minimal vibration—making it perfect for sump setups where quiet counts. Real-Time Feedback Keeps You in Control The COR-20 is like a dashboard for your aquarium’s circulation. With Apex integration, you can monitor: Current flow rates Internal pump temperature Power consumption (watts) Alerts for abnormal behavior or conditions And if things start to heat up? The COR-20 slows itself down until it cools off—giving you time to react before damage occurs. What's Included in the Neptune Systems COR 20 Reutnrn Pump COR-20 pump body COR driver controller 100W DC power supply 1.25" slip to BSPP union fitting 1.0" slip fitting 0.75" slip fitting 3-foot Aquabus cable Note: Apex Controller required to access advanced features via Apex Fusion. Neptune Systems COR 20 Specifications Max flow: 2,000 GPH Max head height: 20 feet Pump dimensions: 3.875" W x 4.875" H x 6.25" D Driver dimensions: 3" W x 4" H x 1" D Input size: 1" slip PVC Output size: 3/4" slip or 1.25" union Power use: <90 watts at 120V AC Apex Compatibility Works with any Neptune Apex Controller Requires one open Aquabus port Unlocks full Apex Fusion control suite The COR-20 offers intelligent control, effortless performance, and silent reliability—making it one of the most ideal return pumps for any serious reef system. Whether you are just starting out or fine-tuning water flow in a quality reef tank, this pump adapts to fit your flow needs.