So I ordered a Nostalgia Electrics KRS2100 Kegorator Beer Keg Fridge that uses D-System Kegs... What is a D system keg and where can I buy them? I have looked at the large home brewing supply stores and I find ball lock kegs and and pin lock kegs. I can find D System couplers and taps, but no kegs. (My next hunch is that D System is the standard and that is why they aren't called out...). Anyway, if someone would shed some light on this, I would appreciate it!