He didn't make it, he bought it from stealthhydroponics.com

I got one about a week ago, all you need to do is get a water pump, and some hose and run the hose into the upper root mass. The Stealth Hydro bubbleponics has multiple hoses from a hub to all the different plants, but just one water pump.
And remember, it "bubbles" out, not pours. I don't know if most waterpumps have an adjustable flow but that would be helpful, i imagine. Like I said I bought mine

edit: just saw Midgrade posted right before i did