Probably be best to put this in the water cooling construction forum. have any info on the properties of this graphite and what forms it comes in? Is it easy to work with? Can it be milled drilled and not break under pressure? Water tight? Withstand 70 watts of heat without breaking down?
Just a few questions off the top of my head. Only graphite I ever used was the graphite powerder lube stuff and graphite fishing poles.