Yes, indeed it is UV reactive tubing, as I said on MSN. As you're going to use Tygon tubing, you will need a dye to make it UV reactive. A good brand is AquaComputer. They have four kinds of additive, of which two are blue UV reactive. BlueMotion is a blue colored additive which will glow under UV light, while ClearBlue is a clear transparent fluid an thus will not be seen when not under UV light. When under UV light it will glow blue.
The choice is yours
I bet there are many shops in the States that sell this stuff, or something similar. Take a look over
here for example.