It is all complete, skimmer, pumps, instructions, etc. It is brand new, never used. I was going to set up a QT with it and changed my mine. It is a HOB unit.
It is 14X14X3.5. That is the box it self. With the skimmer cup it is 18" high. So I say that if someone wants to install behind a tank, they need 4 inches.