I always thought an auto h20 was the best idea ever--that is until you have a flood and loose a couple of bins of your favorite rats!! I had just upgraded to a 5 gal pail for water container and the rats moved nipple and flooded there cage--what an awful sight to see your poor rats drowned. The other time i had an escapee that chewed the line. Ill never go back. Its all water bottles for me now-may take a smidge more time but I have better easy of mind knowing no one will drown. JUST A THOUGHT TO KEEP IN THE BACK YOUR HEAD.