All beer kegs produced for many years are stainless steel. The only aluminum you will find now are some older, european kegs. Spartanburg produces only stainless kegs.
Thanx, MagicMan. That's what I thought. I just picked up a almost new Yuengling keg made by Spartanburg. It's a full 15.5 g keg. Should be good for doing full boil AG brews, ay?