Bitspower G1/4 Thread 3/8" ID x 1/2" OD 90-Degree and Rotary Compression Fitting. (x7)
Bitspower G1/4 Thread 3/8" ID x 1/2" OD 180 Degree and Rotary Compression Fitting (x5)

These fittings are for water cooled systems

I paid $17 a piece for these fittings and will sell them for $10 each
These fittings are for making connections at the reservoir/pump, radiator etc.., so they attach to items in your run. 
These fittings will not work in the middle of a run connecting 2 pieces of hard or soft tubing.