does this skimmer need to be submerged?

[lildingy]

not sure the brand it says SWC on the top.
IMG_20120913_213446.jpg

[Texreefer]

looks like my old skimmer, thats an old dual Octopus skimmer.. its a stand alone but you can place it in sump in you have a sump that big. its fed by an externa pump. the two pumps on it are just for re-circulation