Neptune Systems

COR-20 Intelligent Return Pump (2000 GPH)

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$399.99 $399.99

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Don't have an Apex? No Problem!

The Cor-20 Pump can be used with or without an Apex Controller.

Use With or Without an Apex Controller!

The intelligent Neptune COR-20 Return Pump is easily the smartest pump available. Directly connect to any Apex controller through an Aquabus Port, but if you do not have a controller, don't worry, you don't need one! The COR-20 is capable of stand-alone operation, but also offers 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-Level Technology
  • Energy Efficient
  • Extremely Quiet
  • AquaBus Communication Connection
  • Temperature Monitoring
  • Up to 2000 GPH
  • Internal or External


Don't have an Apex? No Problem!

The COR-20 can be connected to an Apex, but it can also be used in a standalone method, where the controller lets you have simple control over the pump like, increasing and decreasing the speed as desired. Connecting the COR-20 to an Apex Controller can unlock much more potential!


Advanced Control

The COR pumps were built from the ground up with control in mind. Have power over everything including the CORs output percentage, real-time operational feedback, compared feed routines, pump status can all be monitored and controlled with Apex Fusion. Once the COR pump is plugged into an open Aquabus port, and after a couple button presses, you can set the pumps flow rate and feed mode settings. By enabling IQ-Level, you can set the min and max flow rates for your aquarium. 


Neptune Systems COR-20 Flow Chart

Up to 2000GPH

The powerful COR-20 can push up to 2000 gallons per hour with an incredibly efficient head-loss curve. Each pump comes with multiple different output fittings that let you adapt the COR pumps output to match your reef tanks current plumbing size. It is suggested to use the largest 1.25" Union that is included, but it is totally fine to use the other 0.75" or 1.0" adapters if needed. 


IQ-Level Technology

Because not all aquariums are alike, Neptune Systems included IQ-Level technology with every COR pump. Customize the minimum and maximum speed settings for your tanks plumbing to the ideal flow rate, but also the minimum flow rate for in tank flow and feed modes as well. 


Whisper Quiet

Neptune's COR uses the latest in Vector Control, BLDC motor technology. Driving the COR pump in a way that is super energy efficient using less than 50W at full power, and staying vibration and noise free. 


Operational Feedback

Know what is going on with your pump at all times. COR pumps come loaded with features that let you monitor your aquariums "heart" giving you the chance to fix something before it fails. Saltwater aquariums are notorious for creating calcium and other mineral build up on pumps and there internal parts that can inhibit the flow but more importantly could cause damage to the pump. Neptune Fusion lets you monitor the pumps internal temperature along with its wattage draw and flow rate allowing you to set alarms and alerts if something goes out of their normal thresholds. If the temperature of the pump increases to unsafe levels, the COR will actually slow itself down until temperatures reach a safe level again, giving you time to react and maintain the pump.


Compatible with any Apex Controller (requires Aquabus port)



  • Pump Dimensions: 3.875" W x 4.875" H x 6.250" D
  • Driver Dimensions: 3" W x 4" H x 1" D
  • Max Flow: 2000 GPH
  • Max Head: 20FT
  • Input Size: 1" Slip PVC
  • Output Size: 3/4" Slip PVC or 1 1/4" Slip to BSPP Union
  • Power Consumption: Less than 90W @ 120VAC


What's Included?

1x COR-20 Pump Body

1x COR Driver Controller

1x 100W DC Power Supply

1x 1.25" PVC Union (slip to BSPP)

1x 1" Slip Fitting

1x 0.75" Slip Fitting

1x 3-foot Aquabus Cable


Some features require Apex Controller System

More Information
UPC 653078004359
Variable Speed Yes
Gallons Per Hour 1000 - 2000 GPH
Max Head Height 15 - 20 Feet
Control Type Digital DC Control (Controller Included)
Compatible with Controllers Apex
Output Size 0.75" (3/4 in.), 1.25" (1-1/4 in.)
Power Type DC
Power Consumption 90W
Power Cord Length 6 Feet
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Product Questions

Do you guys carry the input cover guard and the output adapter to be able to connect a 3/4” hose for this pump?
Question by: Eduardo Jimenez on Sep 7, 2020, 6:43 PM
Hey there,
Thank you for reaching out to us! We do not carry an input guard for this pump. It does come with a 3/4" output and just needs a 3/4" slip barb for a 3/4" hose.

Please let me know if you need anything further and take care!
Answer by: Matt Lucero on Sep 9, 2020, 12:51 PM
What is the warranty on the pump and on the power supply for the COR20?

Question by: Marc Alvord on Jul 13, 2020, 10:58 AM
Hey there-

Thank you for reaching out to us! The warranty period for the COR-20 and all of its components would be covered under a 1-year warranty. If there is anything else we can do for you let us know. Take care!
Answer by: Brad Ohmann on Jul 14, 2020, 3:58 PM
Do you sell replacement power supplies?
Question by: Patrick on Oct 20, 2019, 2:32 PM
Hey there!

Unfortunately we do not, those are only available through Neptune.

Take care
Answer by: Thomas Billington on Oct 22, 2019, 4:49 PM
Will the core 20 be compatible with Apex classic?
Question by: Leo Skiba on Dec 21, 2017, 2:04 PM
Thanks for reaching out to BRS!

The Cor series of pumps requires a 1Link connection to be controlled by an Apex. For the Apex Classic, this would require the additional purchase of a 1Link module.

Have a great day.
Answer by: Josh Cuta on Dec 26, 2017, 11:54 AM
When are you expecting to receive this item in your warehouse?
Question by: Gurkan on Dec 21, 2017, 12:54 PM
Thanks for reaching out to BRS!

Our current estimate on having the Cor 20 pumps in house is 1/10/2017. Please bear in mind that may change if there are problems with shipping.

Have a great day!
Answer by: Josh Cuta on Dec 26, 2017, 3:06 PM
Is there support for a backup battery with COR pumps or is a UPS your only option?
Question by: Derik on Dec 21, 2017, 9:07 AM
Thanks for reaching out to BRS!

At this point, we do not know of any backup battery in development for this product. A UPS should work fine though.

Have a great day.
Answer by: Josh Cuta on Dec 26, 2017, 11:46 AM