Neptune Systems


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  • Regular price $580.00

Whisper Quiet COR-20

The Neptune Systems COR-20 is a 2000 gph (7500 lph) variable-speed return pump, with brushless, DC-driven motor that runs smoothly and is extremely quiet.

The return pump is probably the most important equipment of your aquarium. The return pump circulates water which carries nutrients, basically the life-blood of a tank.

To maintain a successful aquarium, start with the Neptune Systems COR-20 return pump that is intelligent, whisper quiet and energy efficient.

Can Run Standalone

Neptune Systems COR-20 will run completely standalone OR if you own ANY Apex System, the pump can be connected via its AquaBus port which will enable you to customise many features of the pump.

2000 gph (7500 lph)

A single COR-20 provides enough flow for aquariums up to 180 gallons. Larger systems can use two COR-20 for redundancy and disaster prevention.

Apex Compatible

The COR-20 pump is compatible with all Apex systems including: Apex, Apex Classic, Apex Lite, and Apex Jr. Simply connect the COR driver to the Apex via any available AquaBus port.

Internal or External Applications

With the included fittings, the COR-20 can be plumbed to work either externally, or submerged in a sump.

IQ-Level Feature

Lets you customise the minimum and maximum flow rate for your aquarium

1.25 inch Union

Includes oversized 1.25 inch BSPP to 1.25 inch Slip PVC Union.

Silent and Energy Efficient

COR-20 has a brushless, quiet DC-driven motor which at full run consumes less than 90W power.

No Power Brick

The COR-20 uses the existing power supply inside the Energy Bar 832 or the one shared on the 1LINK module. Hence, there is no extra power adapter brick and power cords required to operate it, thus easy to setup, and a cleaner installation.


The specifications of Neptune Systems COR-20 (some features require Apex Controller System):

  • Pump Dimensions 3.875-inch W x 4.875-inch H x 6.250-inch D
  • Driver Dimensions 3-inch W x 4-inch H x 1-inch D
  • Max Flow 2000 GPH
  • Max Head 20FT
  • Input Size 1-inch Slip PVC
  • Output Size 3/4-inch Slip PVC or 1 1/4-inch Slip to BSPP Union


  • 1x COR-20 Pump Body
  • 1x COR Driver Controller
  • 1x 100W DC Power Supply
  • 1x 1.25-inch PVC Union (slip to BSPP)
  • 1x 1-inch Slip Fitting
  • 1x 0.75-inch Slip Fitting
  • 1x 3-foot Aquabus Cable