I changed out one of my 5 gallon nipple waterers, for this 14 gallon. When I go away for 8 days, the chickens usually have a couple gallons left when I get home. Now I know they will have plenty. I bought the drum new from amazon for $28.74. I took out the seal on the lid so it wasn't air tight and create a vacuum. Here's a link, if anyone is interested. I don't have to rely on anyone to feed and water my chickens, my pop door is open 24/7.