what does double corner overflow mean?

[j_man]

This is the 125 gallon All Glass tank with double corner overflows. These tanks are the best for saltwater reef setups. The dimensions are 72x18x22. The trim on this tank is oak.

I was looking at a tank, and this was the description. What does that mean?

I've always had regular rectangles.

[zhenya]

This is the 125 gallon All Glass tank with double corner overflows. These tanks are the best for saltwater reef setups. The dimensions are 72x18x22. The trim on this tank is oak.

I was looking at a tank, and this was the description. What does that mean?

I've always had regular rectangles.

What it means is that this tank is predrilled for drainage and return plumbing and has two overflows in the corners of the tank. The holes are predrilled in the bottom glass, two holes in each overflow.

[j_man]

Thankyou. so you believe this to be a better off the shelf product than a regular aquarium?

[Reefland]

This is just a regular rectangular aquarium with pre-drilled corner overflows. Here is a link with a diagram of a corner overflow and if you click on teh demonstration button it will describe how it works.
http://www.all-glass.com/products/aquariums/index.html