No you shouldn't need that for that particular water cooler, that is a cpu only fully self contained water cooling system, but if you do want your gpu watercooled that will not work for you, unless you plan on buying a similar cooler to that one for you gpu as well, but then you are stuck with two smaller watercooling systems, as opposed to one. All that is in that one is some small tubing between the radiator and the cpu block which seems to have a small pump located on top.
But to be honest you would probably better off investing in a good fan/heatsink combo rather than that watercooling system. If you want the true effectiveness of watercooling you are gonna have to go with a regular water cooling set up but thats at least a few hundred $.
