Eclipse L Overflow Box (1000 GPH)

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Discontinued by Bulk Reef Supply
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Quiet, Slim, Plug & Play

The Eclipse aquarium overflow system consists of a slim black box that is mounted inside of your tank and a clear external box that mounts outside of your tank, to transport water down to your sump with as little noise generated as possible. The DIY project only takes a few minutes to complete and compared to HOB style overflows, the Eclipse has a fail-safe design that includes three drain bulkheads for a Herbie or Bean Animal method of plumbing. 


The internal/external design for the Eshopps Eclipse Overflow Boxes creates a minimalistic design inside the aquarium, extending less than 1.25" inside the aquarium. Water can flow through the 1/4" teeth in the wet-side of the overflow, and then through the included bulkhead into the external box that holds additional bulkheads to let the water drain down into the sump. It is required to drill your aquarium with the Eclipse overflow but drilling is fairly simple and with the included glass drill bit and drill guide. The guide helps you set the perfect water level for your aquarium and then lets you know exactly where to drill your hole(s). 


Selecting the right overflow for your tank can be confusing but it is a pretty simple formula, just take the total flow produced by your return pump and select an overflow that can handle that overall flow rate, and still be able to fit inside of your aquarium. In most cases, we will recommend using an overflow that is +1 sized for your application. That lets you upgrade to a larger pump or tank in the future, with an added safety benefit of being able to handle additional flow if one drain gets clogged or restricted. 


Installation Tip - When installing the bulkhead gaskets we highly suggest placing one between the inner overflow box and the aquarium. The other gasket should be placed between the external box and the bulkhead nut. 



Max Flow Rate - 1000 GPH

Max Tank Size - 150 Gallons

Total Dimensions - 12" L x 3" D x 6" 

Internal Dimensions - 12" x 1.25" x 6" 

Drain Bulkhead(s) - 1" PVC Slip x Slip


What's Included?

1x Eclipse L Overflow Internal Box

1x Eclipse L Overflow External Box

1x External Box Lid

2x 1.5" Transfer Bulkhead

3x 1" Drain Bulkheads

1x Red PVC Standpipe

1x Drilling Template

1x 60mm Holesaw

More Information
UPC 696859958625
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Product Questions

Just confirming. These bulkheads are pvc and not abs? Wanting to cement them
Question by: Cy on Feb 15, 2024, 11:38 PM
Hey there,
Thank you for reaching out to us. Yes those are pvc pipes. Please let me know if you need anything further.
Answer by: Thomas Wofle (BRS Staff) on Feb 19, 2024, 8:38 AM
What size schedule 40 pipe should i purchase to fit the drains on this overflow?
Question by: Cliff on Mar 7, 2020, 11:36 PM
Hi there,

They are 1" drain bulkheads so you need 1" tubing or piping.

Take care
Answer by: Thomas Billington on Mar 11, 2020, 11:12 AM
The large eshopps overflow picture shows 2 1.5" bulkhead, but the product list says only 1x 1.5" bulkhead..
Can you confirm whether there is one or 2 please?
Question by: James Platt on Jan 1, 2018, 7:29 PM
Excellent catch!

That should be 2x 1.5" transfer bulkheads. Have a great day!
Answer by: Josh Cuta on Jan 8, 2018, 5:19 PM
can I use it on tank with rim?
Question by: Mohamed on Dec 28, 2017, 3:11 PM
Thanks for reaching out to BRS!

The Eclipse overflows can be used on both rimmed and rimless aquariums. Have a great day!
Answer by: Josh Cuta on Jan 2, 2018, 12:38 PM