I am sure that you have checked out Dteks heatercore w/ 1/2" barbs already installed.
Were you looking for; a much larger heatercore or just wanting to have it be a DIY type of job? 
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Athlon64 X2 4200+ @ 2.5Ghz (250FSB x 10)
OCZ VX 1GB 4000 @ 250FSB (6-2-2-2 timmings)
DFI LANParty nForce4 Ultra-D
SCSI Raid 5 x (3) Cheetah 15K HDDs
LSI Express 500 (128MB cache)
OCZ PowerStream 520W PSU
ATI X850XT PE (Stock)
DTEK WhiteWater + DTEK Custom Radiator
Eheim 1250
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