Is this the right overflow box?
Column overflows are intended for installation in the middle of an aquarium, usually in frags or walk around tanks for viewing from all sides. Since only the bottom of the skimmer is attached, Column overflows are always open bottom.
How to measure for the perfect fit.
Many glass aquariums have a plastic rim along the top edge. Measure the depth of the tank from the bottom of this rim to the bottom of the tank. Your overflow will be fabricated to the size you select. For rimless tanks, measure to your preference.
Please remember the size of the box you select is the size we make the box. Dimensions are external measurements.
Water inlet slots are approximately 1/4 inch wide and extend down approximately 1-1/2 inches from the top of the box. Keep in mind your water level will generally be at the bottom of the skimmer slots.
No charge optional return holes.
We will drill 3/4 inch return line hole(s) at no charge upon request. The hole(s) will be drilled approximately 4 inches from the top of the overflow.
You will be able to submit your request for drilling instructions at checkout.