Closure part for a barrel (glass, rubber, wood, ceramic, plastic, silicone), which is inserted into the bunghole. In order to let gas escape or to allow ventilation, the bung can also be inserted loosely or it has a corresponding device (valve) that allows this in one direction only. This is also called fermenting bung (see fermenting attachment). In this case the barrel is stored in such a way that the bunghole is at the top. If one wants to achieve during the barrel removal that no ventilation can take place, then the barrel is...