The invention relates to containers commonly used for the sale of wine, including a tap essentially comprising a stationary body and a deformable elastic plug that tends to stay closed. According to the invention, transverse grooves are provided at one of the rear corners of each of the windows in which the flanges move and, by means of the angular rotation of the cylindrical cap, said grooves can be used to lock the flanges axially in the forced closed position, before and after removing the seal, thereby hindering the opening of the tap, which requires a combined rotation and pulling movement. In addition, the stationary and moving elements include coaxial through-holes allowing the installation of a padlock preventing unauthorized persons from accessing the container.