Internal Overflow without drilling and without Siphon?

[Kasey Grohowski]

https://www.bulkreefsupply.com/eclipse-l-overflow-box-1000-gph-eshopps.html#tab-reviews
I was skimming through brs' store when I came across this. Wont this accomplish the same as drilling the tank, without actually having to drill it? No siphon needed correct? Has anyone ever had success with an overflow like this? Also if I wanted to get 2200 gph, would I be able to use 2 overflows or is that just insane? Thank you.

 

[Dj City]

You have to drill the tank to use that. It's an external overflow.

 

[duncangweller]

You still need to drill the tank for this overflow. The 'inside' box has two bulkheads that connect to the 'outside' box. Two holes need to be drilled to make this happen.

It says about drilling in the item description.

I have one but I haven't installed it yet so can't speak for how well it works, but I've heard good things.

 

[Kasey Grohowski]

You still need to drill the tank for this overflow. The 'inside' box has two bulkheads that connect to the 'outside' box. Two holes need to be drilled to make this happen.

It says about drilling in the item description.

I have one but I haven't installed it yet so can't speak for how well it works, but I've heard good things.

What makes it different from just regular overflow?

 

[Dj City]

No siphon.
Water goes into the hole drilled into the tank where it enters the overflow. From there it flows down to the sump.