External overflow boxes drain water from a display tank into a sump or wet/dry filter when paired with an aquarium that did not come pre-drilled.

We carry several sizes to assure you’ll we’ve got the right overflow box for your flow rate.

Don’t forget to add an Aqua Lifter Vacuum pump or a powerhead with venturi capability (Maxi-Jet powerheads are a customer favorite) to ensure your overflow box maintains the proper siphon and restarts automatically following a power outage.

Built-in overflows are the most efficient way to drain aquarium water into a filter. If your aquarium does not have a built-in overflow, an overflow box is the best alternative for getting tank water into a filter system without spending a fortune on tank modifications. They also skim up to six times more water than units with tubes.

Overflows/Pre-filter Advantages:

Easily adjust aquarium water level to precisely the right amount for your setup
Plastic screens help prevent fish loss
Quiet operation

Manufacturer

CPR Overflow Boxes

If your aquarium does not have built-in overflow, CPR Continuous Siphon Overflows/Prefilters are the best means for getting water from an aquarium to a filter system without expensive modifications to the tank.

Tom Aquatics Pro Series Surface Skimmer Overflow Box

The Patented Surface Skimmer Overflow efficiently skims the surface water of the aquarium, removing dissolved organics and other waste material.

Featured Products

CPR CS100 Overflow Box	Tom Aquatics Aqua-Lifter Dosing Pump	Tom Aquatics Pro Series Surface Skimmer Overflow Box with Aqua Lifter
Price: $119.99	Price: $14.99	Price: $109.99

Shopping Cart

Cart:
Subtotal:
Shipping:
Total:

0 items
$0.00
$0.00 $0.00

Email Specials

Newsletter Tips & Tricks! New Products!
Discounts & Promos!

Email is Private & Secure

Testimonials

March 06, 2010
"Marine Depot is AWESOME. I purchased my item and it was at my home in two days using normal UPS shipping!!! Thank you for your great customer service."
Michael

March 05, 2010
"Delivery time is unsurpassed. If you need it fast, there is no place faster than Marine Depot for standard shipping. They also have almost anything I could need for a reef tank."
Grey Seaslug

March 01, 2010
"They have so many great products and it’s a very easy website to navigate! From all-in-one to do-it-yourself, there is something for everyone! Awesome summaries at the top of every major heading! This company does a great job and the website is great!"
David Peron

15% Off for Life - All RO & RO/DI Replacement Filters