I was walking in Wal*Mart one evening and went past the pet asile. I picked up some inexpensive aquarium supplies with the intent of putting together my plant watering system. I also went to the hardware asile and picked up a 24 hour light timer. In the end I had to go to a pet specalist store to get the valves that I needed to get it to work.
Here is my supply list
25' Airline Tubing ($2)
4 Gallon Bucket ($2)
Aquarium air pump ($10) - I got a dual line mode, beefier the better (not pictured in the instructable)
24 hour timer ($4) - Originally I used a 1 hour timer, but I found a 30 minute timer that worked better
Lee's Airline Control Kit ($4) - Cat no. 14103 - This is the perfect set for this project - it contains 4 Tee junctions and 5 valves. The valves are inline and all plastic.
Check Valve (Free) - This should come with your pump and is very important for safety (not shown in pictures)
Step 1: Prepare the junction and valve
Then take the tee junction and press the valve body on to the perpendicular part of the tee.
If you have a different type of junction or inline vavle you made need to fashion a small length of hose to join the tee and the valve - it'll work just fine.