Tried the hair dryer method first, it worked ok and got most of the curl out of the tube, but not all of it. So then i tried the boiling water, and it worked pretty well. Before I just used really hot tap water, it helped but not much. the boiling water made the tube really soft and i was able to roll it very tightly back onto itself it in the oppisite direction of the curl. I tied some string around it to hold it in place, then let it cool down like that for about 2 or 3 hours. was kinda wavy at first, but after a few more hours it became fairly straight.
Thanks for the tips. The dryer would have been fun to try, but i got the tube installed already.
Next project, Finish my sump build.
-Steve