A connector device for connecting two containers with first and second members slidably displaceable in regard to each other along an axis between a first and a second position is presented. The first member comprises a needle parallel to the axis so that the first container's septum is penetrated by one end of the needle when the first container is introduced into the first member. The second member comprises a coupling to the second container. The other needle end penetrates the second container's septum when the members are in the second position establishing a connection between the two containers. The first member comprises a coupling to the second container coupled to the second member. The first member can couple to the second container when the two members are in the second position and cannot couple to the second container when the two members are in the first position.