I have a Light Giant Pump model 2MDSC. Haven't used it for a number of years but it still works. It's not submersible and runs in line. I think it rated at 450gph.
Little Giant us the manufactor, they have a web site. The pumps are similar to the Iwaki and run protein skimmer or wet/dry systems. I got it for my wet/dry system before they had subermible pump powerful enough to run my the wet/dry.