An elongated teat cup liner (1) located inside said teat cup, which is having a proximal portion in communication to the milking vacuum system and the milk pail and a distal portion in communication with the animal teat; said teat cup liner comprising: a plurality of segments (1f-1h) barriered by a means of one or more rings (1a); and, a vacuum duct comprising a plurality of vacuum valves (3b-3d); each of said valve is in communication with one or more rings and is adapted to provide a reversible inflation/deflation of elastomeric rubber-like sleeve.