We had four large 55 gallon blue drums that were used as floats for a raft. After years of use, cracks appeared on the inner surface of the original corks, causing water to seep into the kegs. I searched the internet for replacement plugs and found a few from a seller with a $100 minimum order. I didn't need that many plugs - only four at the moment plus four to replace in the future. They came two in one package and worked great. Just pay attention to which cork you need - coarse thread or fine thread - otherwise you will be disappointed.