Fiji Cube

LoPro External Overflow Box (1600 GPH)

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Fiji Cube's unique design takes low-profile overflows to the next level!


We were immediately impressed by the thoughtful design and unique features of Fiji Cube's overflow boxes. The wet side overflow box is among the slimmest on the market, but what really sets it apart is the ease of servicing and maintenance that they built into their surface-skimming weirs with a removable, o-ring sealed interface that slides into the bulkhead. The wet side can be easily removed for cleaning or other servicing needs, and slides back in just as easily. There are no annoying bulkhead nuts to remove in tight spaces, so you don't have to worry about completely undoing your dry-side plumbing if you need to remove the weir. This also provides easy access to the tank bulkhead and just makes overall maintenance easier.


4 Sizes to Choose From:

  • 400 GPH (Dual Drain)
  • 800 GPH (Dual Drain)
  • 1,600 GPH (3 Drains)
  • 2,400 GPH (3 Drains)


Fiji Cube also includes a guide template for drilling so that you can get the bulkhead hole positions and water level just the way you want it without any worry. Build quality is top-notch with solid construction and a nice tight fit on all components, and each overflow is designed with multiple drains for redundancy and safety. The larger 1,600 GPH and 2,400 GPH models include three drains to accommodate a Bean Animal style overflow setup for the ultimate in safe, reliable, and super-quiet overflows.



  • Slim and compact design to suit any aquarium set-up
  • Works with rimless, eurobrace, and standard trim aquariums
  • Entire skimmer box pulls off for routine maintenance
  • 3/8” thick acrylic mounting wall and base on exterior box
  • Front and back lid cover included to quiet noise
  • Template & diamond hole saw included
  • PVC pipe included for emergency drain
  • Primary & emergency drain bulkheads; perfect for Herbie style drains



  • Skimmer Box Dimensions: 16"L x 1.25"W x 4"H
  • Exterior Box Dimensions: 16"L x 4"W x 6.25"H
  • Max Flow Rate: 1,600 GPH
  • Drain Bulkhead Size: 1.5" x 3
  • Max. Tank Thickness for Mounting: 14mm


What's Included?

  • Fiji Cube 1,600 GPH LoPro Overflow assembly
  • Glass Drill Bit & Hole Guide


pdf Fiji Cube Low Profile Overflow Instruction Manual


More Information
UPC 761856629837
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Product Questions

I am wondering if the 3 Drain Bulkheads are slip or threaded. It seems they are 1.5 inch in size but I would like to know if I am need to purchase cement and a straight pipe or a threaded adapter? Thanks!
Question by: Andrew on Apr 19, 2023, 11:21 AM
Hey there,
Thank you for reaching out to us. They are slip.

Please let me know if you need anything further and take care!
Answer by: Matt Lucero (BRS Staff) on May 23, 2023, 9:14 AM
what is the distance in between the drilled holes? i have predrilled holes from an eclipse L and eant to upgrade to this one but not sure if they are the same distance in between thanks!
Question by: jesus on Nov 8, 2022, 5:54 PM
Thanks for the question! This kit uses 2x 1.5" ABS bulkheads and they are spaced 13cm apart from center to center for each hole. Please let us know if we can help with anything else!
Answer by: Kyle Thomas (BRS Staff) on Nov 10, 2022, 10:27 AM
what is the diameter of the glass holes?
Question by: Marcel Paz on Jun 9, 2022, 6:07 PM
Thanks for the question! The transfer bulkhead is 1.5", and uses a 60mm drill bit to drill the hole and is included with the package. Please let us know if we can help with anything else!
Answer by: Kyle Thomas (BRS Staff) on Jun 10, 2022, 9:52 AM
Hello, please tell me, I can't understand, is it suitable for a glass thickness of 19 mm? LoPro External Overflow Box (1600 GPH) - Fiji Cube
Question by: Vadim Panyshev on Dec 6, 2021, 8:07 AM
Thank you for your question. Yes, the LoPro Overflow can be installed on a tank with 19mm glass.
Answer by: William Glenn (BRS Staff) on Dec 15, 2021, 9:21 AM