here is some info about using copper pipes for your loop.
The copper pipes that U need to use are 12mm O/D they have almost the same size the the crystal link tubes from BitsPower.
Crystal link. (BP-WTP-C47 and BP-WTP-C48)
Copper pipe
In the Bitspower fittings U can see the rubber ring inside the fitting this will give a perfect seal around the copper pipe.

If U live in the US or Australian U will have some difficulties finding the right size of pipes. If U do find it always do a check up and measure it your self.
The materials U all need:
Something to cut the pipe
Pipe bender 12mm
Round and a flat file
Sanding paper starting 250,500,800,1000,1500,2000 grid
Polish i have used Commandant Nr4
For the bending and placing the copper pipes in your loop U will just need to give it some tries that is a part where I don't know to help U out with.
But when U cut a piece of pipe of and U start to fit it in the loop U need to make sure that U clean up the end of the pipe else will damage the rubber ring and this will cause leaks.
Freshly cuted copper pipe.
Cleaned up with file and sanding paper.
This is all u need to know to start with your loop I think. If U have any questions you can send Pm of just answers in this topic

When I completed my loop it looked like this.

All these pipes where sanded and polished afterwards to get a nice copper bling look.
Efe Copy past gedaan van prject log van project White.