Overflow Boxes for Aquariums

An aquarium overflow is a necessary part of an aquarium sump plumbing kit. If you want to run an aquarium sump but don’t have a reef ready aquarium, or a drilled aquarium, then your aquarium sump plumbing will need to include an overflow box (we also sell overflows for drilled tanks). The overflow box hangs on tank. The inside half is a surface skimmer that draws protein rich water from the aquarium. A siphon establishes water movement. On some overflow boxes, an aqua lifter pump helps to create or reestablish siphon after power outage.

The external half of an overflow box is a gravity drain that sends water to your sump via an aquarium drain hose. A return pump then delivers water back to the display aquarium. As the water level rises inside the display aquarium, it cascades into the overflow box, completing the aquarium overflow plumbing loop.
30 Results
CPR Overflow Sponge For CS90, 100, 102

CPR Overflow Sponge For CS90, 100, 102

Tom Aquatics Aqua-Lifter Dosing Pump

Tom Aquatics Aqua-Lifter Dosing Pump

Tom Aquatics Aqua Lifter Suction Pre-Filter

Tom Aquatics Aqua Lifter Suction Pre-Filter

Marine Depot Overflow Box OF-800

Marine Depot Overflow Box OF-800

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

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

Marine Depot Overflow Box OF-300

Marine Depot Overflow Box OF-300

Marine Depot Overflow Box Nano

Marine Depot Overflow Box Nano

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

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

Marine Depot Overflow Box OF-1200

Marine Depot Overflow Box OF-1200

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

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

CPR 1-1/4 inch Drain Hose

CPR 1-1/4 inch Drain Hose

Eshopps Overflow Box Eclipse - M

Eshopps Overflow Box Eclipse - M

Eshopps Overflow Box Eclipse - S

Eshopps Overflow Box Eclipse - S

Eshopps Overflow Box Eclipse - L

Eshopps Overflow Box Eclipse - L

Crystal Glass Lily Pipe (16/22) with Surface Skimmer - Dymax

Crystal Glass Lily Pipe (16/22) with Surface Skimmer - Dymax

CPR CS202 Overflow Box

CPR CS202 Overflow Box

Xaqua INOUT Hose Kit for Overflow Box and Return - Marine Water

Xaqua INOUT Hose Kit for Overflow Box and Return - Marine Water

Stainless Steel Lily Pipe (12/16) with Surface Skimmer - Dymax

Stainless Steel Lily Pipe (12/16) with Surface Skimmer - Dymax

Stainless Steel Lily Pipe (16/22) with Surface Skimmer - Dymax

Stainless Steel Lily Pipe (16/22) with Surface Skimmer - Dymax

Crystal Glass Lily Pipe (12/16) with Surface Skimmer - Dymax

Crystal Glass Lily Pipe (12/16) with Surface Skimmer - Dymax

CPR CS150 Overflow Box

CPR CS150 Overflow Box

Prodigy L Slim External Overflow Box - Eshopps
new

Prodigy L Slim External Overflow Box - Eshopps

Prodigy M Slim External Overflow Box - Eshopps
new

Prodigy M Slim External Overflow Box - Eshopps

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