Do you know where I can find 90 degree elbow barbs with the 9/16-18 threaded fittings Danger Den uses? I received this threading info from their R&D guy. I want to set up 2x NV-68 blocks on my Asus A8N-SLI board. There is not enough room for the 1/2" tube to clear the bottom block, even on the more spacious A8N. My solution was to modify the straight barbs with elbow barbs like you suggested; this would kind of end up looking like the Innovatek NV-40 block's barbs. It seems Danger Den is having trouble tracking down elbows with their specific threading, so I may just have to solder copper non-threaded elbows directly to the blocks copper as a solution - what do you think?