Yes, I beleive it is. But i guess it kinda depends on your pump. If you want to make a larger resivior I would just use extra plastic, and some caulk (if you want to get it done in 10 seconds) otherwise I would suggest going on ebay and looking for one.
In all reality a resivior is simply a cut off milk carton (so to speak). It is simple to make, and if you have like a submersable pump and a (20 gal.) fish tank all you need is a CPU block and some tubing, and you can make a good watercooling system just like that. Just add a little ICE, and VWALA! Custom made water cooling system, thingy.
Yes, it's doable, you need some sort of container with a thicker sidewall, at least that's what I suggest. Also, threading the holes makes the barbs go in easier. Also, sealing up the barbs with silicone will help prevent leaks.
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