Closable container, and methods for filling containers

A container with a closable opening, comprising a container body which is formed by a wall, the container having an outside and an interior, the container furthermore comprises an assembly for providing a closable communication with the interior of the container body;

• the assembly comprises a female element, a male element and a plug;
• the female element having a body which is secured in the wall of the container body, with an axial bore which extends through the body, from an insertion opening for the male element on the outside to a seat, which extends around the bore, for the plug in the interior of the container body;
• the plug serves to close the bore when positioned in the seat;
• the male element has a closure means and a tubular part which fits into the axial bore;
• the male element is provided with a passage which extends through the tubular part from the closure means to a head which is able to interact with the plug in order to press the plug off the seat, the closure means being provided for closing off the passage;
• a coupling means is provided for coupling the body of the female element and the male element to one another, the coupling means providing resistance to the male element being pulled outwards out of the bore.