Bucket. I haven't seen it since we finished the boil, chilled, and pitched. I guess that was Saturday so almost a week. It's at a buddy's house (my roommates aren't fond of the smell post-boil so tend to do it over there) and he's yet to see bubbles. Just the water levels going up and down. Temperature is right. We had always used a three piece before and always saw bubbles. This is our first time with a one piece.