I had a similar problem with my Haier Kegerator. It would fit American 1/2 barrel kegs without a problem. I ran into issues with German Beers. My Warsteiner keg is skinnier and taller and would not fit with the German coupler, so I had to get a elbow adapter like the one below to make it work. All is well, but now I have 3 cornies in it with a 3 faucet tower for homebrew. My commercial keg buying days are pretty much over.