What he said. To add, there should be a tab on each side where you can stick a somewhat small (but tough) flathead screwdriver. Pry out the top part of the retaining ring, whichever side that may be. Once the top portion is out get some pliers and pull the rest out little by little. To put it back in, get the bottom part of the ring started, then use the pliers to clamp the rest of it in working your way around little by little. It only takes like 20 seconds each way once you know what you are doing and have the right tools. Don't get the kegman kit. Btw this is for most American D-type sanke kegs. However, there are some that don't have the tabs on the sides, but most do.