I realize my answer comes a bit late, but I would not buy that water block.  For 2 reasons, and before I give them let me say I have a couple of those and have used one on a Hashfast board...

1. You can get that block cheaper on Ebay
2. and more important, you want blocks that have G1/4 fittings.  This is the industry standard basically for computer water cooling.  Almost all gear you look at will be G1/4 so using this and only this will assure you are always compatible.