Best tubing hands down is medical grade silicone tubing, though it can be slightly costly. I've been using it for years now and it NEVER discolours and always remains very flexible.
So much hog wash being talked here regarding water cooling.
@ Illuminist, for what it's worth if you do your research you will note that in a all copper loop (block, rad, etc, all components being the same metal, ie copper) you don't need to worry about corrosion or algae etc. The BEST and I reiterate BEST thing to run in your loop is plain and simple distilled water full stop......do the research and you will see that this is indeed a fact......you don't need all that anti freeze crap!!!, it's nothing more than a block clogger.
I've been water cooling for on 15 years now and have only ever used distilled water in an all copper loop (in the beginning I used an anti freeze additive once and after breaking it down later on for cleaning noticed the block becoming clogged and full of gunk, that was the end of that!)......I personally always use only cable ties now for securing all my tubing, easy and fail safe if done correctly (though not the most esthetical pleasing but I'm into functionality rather than looks) and prefer 3/8" ID tubing over 1/2" barbs as it creates a nice secure fit and then minimal tension is required with the cable ties to ensure a never leak scenario.
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