while i was plumbing up my new rack i thought about that old 2 gallon rubbermaid water dispenser i had dropped and broke the spigot on it would be great for a bucket. well i took the spigot off and measured the hole inside it and heck yea its exactly the size you need for the tank connector. so i cut the spigot off and put it all together and it works great! no drill bit needed just need this and a hacksaw blade and a knife to clean the hole up.
http://www.rubbermaid.com/rubbermaid...d=HPProd100033