Pan world 200ps. It is one step down from the 250ps. The 200ps is rated at 1750 max gph with a max head pressure rated at 39ft. The 250ps is 1900gph max flow with a max head pressure of 45ft. (Here is a decent short read on head pressure ( http://www.aquariumpros.com/articles...%20pressure%22 ) Richard and Mark got the pump for me so I don't know where to get one from, I think I paid under $250. It is nice a quiet compared to the Iwaki ones that I have heard and it also comes with a heavy duty 6ft. power cable.