Overflow Box

Overflow boxes are essential for safely transporting water from your display tank to a sump or filtration system. Whether you're running a reef setup or a fish-only system, an aquarium overflow box allows for continuous water exchange without disrupting the display.

This collection includes a variety of saltwater overflow boxes, from hang-on-back styles to internal designs. Many feature noise-reducing chambers and fail-safe mechanisms to prevent flooding in the event of power loss. A well-designed overflow box for reef tanks helps maintain stable water levels, promotes better oxygenation, and supports cleaner, more efficient filtration.