You see a beer cask.
Location
You can find these throughout whole Tibia, in most cities and in some buildings and creature settlements. There is one in Thais, in Frodo's tavern.
Notes
It can be used to fill Fluid Containers with beer.
It looks the same as a Lemonade Cask, a Cask of Brown Ale, a Cask of Brown Ale (Item), a Rum Cask, a Small Cask, a Water Cask and a Wine Cask.