Wow, That was EXCELLENT service by Burpee!!
While I am inclined to remove the Gurney's link, there are some folks who only want a single height 30 inch cage for Peppers, or the dual height 60 inch for tomatoes - - and do not need the 76 inch capacity of the Burpee cages - - so you see my dilemma.
For the AWS, you will need the Pressure Regulator as well as the "T" connections, tubing, etc. so the 2 unit kit would be the minimal I would purchase. As I KNOW you will be building additional 'Tainers in the coming years, why not just order the 6 unit kit for about $99.00 and be done with it.....
Raybo