I got all of the parts to do this at the garden and aquarium sections at Wal-Mart. I still haven't finished, I have the tubing run but I'm figuring out what I want to do for the wiring. I bought a one-way aquarium check valve which is supposed to restrict flow enough to keep it from gravity feeding. It was only 2-3 bucks. I won't know how it works until I get around to setting the system up.