Could be worse, when I assembled the loop in my 775 machine (current workstation) I used an unusual variant of 3/8" (Something like 9mm ID 14mm OD) which used brass barbs nobody makes anymore. The loop leaks, but I cannot get parts to repair it short of replacing all of the tubes. Then there's another problem, because some of the parts use a thread pitch which is also no longer available. Sucks really, considering the machine runs 24/7 and the loop could break at any second if the brittle tubes decide to finally give way.
Nobody makes the same formula of fluid anymore either, so if I run out and cannot top it up (currently I am using reclaimed fluid from another person's loop to top it up) I'd have to replace the fluid. Problem; there's no drain valve, so I'd have to detach tubes and as already stated, the tubes are brittle and cannot be replaced, what if it breaks? I knew I should have used 1/4 threads and 1/2" tubing, but I had no room to route it and when the system was made a much smaller tube with thicker walls and smaller inner diameter was fairly normal. I do have some spare left, not enough to fix the loop should it break, but I have often wondered if I could stretch another size over the barbs or else make an insert and jubilee a thicker tube over the existing pipe to replace parts that leak. I seem to think 10mm copper for gas appliances was a snug fit inside the tubes, that it could be forced down them, so that may be an option should it come to that. With any luck I will have the Xeon machine up by the end of the year, so I only need the loop to last me that long, because once the Xeon is in place I will just be running this machine into the ground, it's all too far worn out to get much of a second life anyway.
So yeah, at least yours is just a hypothetical loop, it could be much worse.
As a last note, I have a Socket A water block, in fact I have a complete cooling loop for one, but annoyingly I do not have the backplate for it so I cannot mount it. I was tempted to just be silly with it and glue it to a Pentium 1 or something, you know, for the lulz and all that.