The Keg Valve

The Keg Valve Kegs come with their own unique locking systems that don’t let even a single drop of beer out and keeps the beer fresh. It has a concentric valve system at the top and consists of a hole at the centre which is blocked by a spring-loaded ball. This is connected to the bottom of the keg through a long narrow tube. Source URL : https://barobjects.com/draft-equipment/keg-coupler.html