Marine Depot

Marine Depot Elite OverFlow Box w/ Holesaw Drill Bit - Medium



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Ready to upgrade your filtration? The Elite Overflow Box will open up a whole new world of filtration for your glass or acrylic aquarium.

The Marine Depot Elite Overflow Box is a high quality and economical overflow box that allows you to easily add a sump, refugium or wet/dry filter to your aquarium filtration system. These overflow boxes allow you to skim water from the surface of the aquarium and deliver it to your external filter without the need of expensive modifications to your aquarium.

The Elite Overflow is a slim black box minimalist design, allowing more room in the aquarium for aquascaping and swim room for your livestock.  The Elite will also effectively transport water to your sump with as little noise as possible.

The included 60 mm diamond coated hole saw and template makes for a great DIY project.  Once drilled, the Elite is a simple, plug and play overflow system; however, we do recommend that any drilling and installation be performed by a professional1.


  • (1) Black Wetside Box 
  • (1) Clear Dryside Box
  • (1) Template
  • (1) White Safety PVC
  • (1) Holesaw (60mm Diamond Coated Holesaw)
  • (1) 1.5" Bulkhead
  • (2) 1" Bulkhead for Small & Medium Elite Models
  • (3) 1" Bulkhead for Large Elite Models
  • (1) Black Cover Lid


  • Rated for aquariums up to 150 gallons
  • Internal Dimensions: 8"L x 1.25"W x 6"H
  • External Dimensions: 8"L x 3"W x 6"H
  • Suitable for tanks up to 5/8" thick


Aquarium Rating Internal Box
Dimensions (LxWxH)
External Box
Dimensions (LxWxH)
Drain Bulkheads
(Count x Size)

Elite Small

up to 90 gallons 6" x 1.25" x 6" 6" x 3" x 6"2 x 1"

Elite Medium

up to 150 gallons 8" x 1.25" x 6" 8" x 3" x 6"2 x 1"

Elite Large

up to 200 gallons 12" x 1.25" x 6" 12" x 3" x 6"3 x 1"

Marine Depot is not responsible for damages caused by drilling. Please check with the tank manufacturer before drilling, as it may void warranty.

Product Manuals & Documentation

Marine Depot Elite OverFlow Box w/ Holesaw Drill Bit - Medium

Owner's Manual available for download in Adobe PDF file format

Manufacturer Info

Marine Depot was started in 1998 by a self-professed reef geek and pre-med student Ken Wong. Ken envisioned a one-stop shop where customers could find everything they needed, from technical product specifications, reef aquarium information, expert advice on the hobby and friendly one-on-one customer support. Having grown from a one-man crew to being one of the world’s largest suppliers of reef and marine aquarium products, this very core philosophy still lives strong in the Marine Depot culture 20 years later.

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9 Questions
Displaying questions 1-9
In which order do the gaskets go between the boxes and the glass? I have two gaskets.
Asked : May 16, 2020
By : Eric Hittle, Pasadena md
Gaskets always go on the inside of tanks. it's easier to use the weight of the water to push a tight seal than it is to have the weight of the water pushing against a seal on the outside :-)
Answered : May 18, 2020
By : Craig, Texas

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