The device for the transfer of a medium comprises a magazine having two main faces (17) of which one is adapted to cooperate with a container and a lateral face (18) extending between said main faces (17) as well as at least one sliding valve (3) housed in a cavity of said magazine (2) and in which there is formed a transfer duct (59) for said medium which issues on said face (17) adapted to cooperate with said container, said valve (3) having a closed position in which it sealingly isolates said duct (59) from said container and an open position in which said duct (59) is placed in communication with said container; said valve (3) comprising a valve member (40), an isolation sleeve (41) surrounding at least partially said valve member (40) as well as spring means (58) adapted to be compressed by said valve member (40) when said valve (3) is in its open position.