Eclipse M Overflow Box (800 GPH)

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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 a minimum of two drain bulkheads for a Herbie 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 - 800 GPH

Max Tank Size - 100 Gallons

Total Dimensions - 8" L x 3" D x 6" 

Internal Dimensions - 8" x 1.25" x 6" 

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


What's Included?

1x Eclipse M Overflow Internal Box

1x Eclipse M Overflow External Box

1x External Box Lid

1x 1.5" Transfer Bulkhead

2x 1" Drain Bulkheads

1x Red PVC Standpipe

1x Drilling Template

1x 60mm Holesaw

More Information
UPC 696859958618
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Product Questions

I screwed up and messed up the pvc I glued into the 1 inch bulkheads and so I have been looking for 1 inch bulkheads to to replace the included 1 inch bulkheads and every one I have ordered online have had to large of threads and barely didn’t fit. Does your 1inch bulkheads fit the Eclipse medium as a replacement for the 1 inch bulkheads?
Question by: Chase on Sep 13, 2020, 11:02 PM
You would need to buy the bulkhead from the manufacturer.
Answer by: Matt Lucero (BRS Staff) on Nov 5, 2021, 9:26 AM
I am looking for the connectors to attach to this. My fear is simply putting a hose on will leak as it's threaded and not barbed. So I'm looking for female threaded to a barb connection. Add in some gate valves for the tubing to control the flow out and back. Do you have those? I can't locate and Home Depot PVC doesn't match up to the threads. Thanks
Question by: Jeff Karnes on Sep 16, 2019, 6:39 AM
Hey there!

You will need this barb to thread into the drain https://www.bulkreefsupply.com/schedule-80-straight-barb-x-male-thread-1-4b880d619bbbcbbea22b13bfa30a1ace.html However we do not sell gate valves compatible with soft tubing. Only this one https://www.bulkreefsupply.com/two-little-fishies-ball-valve-1-486d016ed2f8a1de28c4b664be01f35f.html
Answer by: Thomas Billington on Sep 16, 2019, 1:41 PM
Hello! What is the size of the two pipes in the buttom of the ESHOPPS - ECLIPSE M OVERFLOW BOX? Best regards Viktor
Question by: Viktor Garde Thomsen on Jan 2, 2019, 11:50 AM
Thanks for contacting BRS!
This overflow does come with two 1" slip bulkheads so that will glue directly to 1" PVC. Have a great day!
Answer by: Noah on Jan 4, 2019, 10:23 AM