Abstract: This invention is concerned with a plastic end closure of a container that is primarily intended for beverages. It consists of a body that is tightly attached to the container and an opening device that can additionally be used to cover the in-and-out hole. According to the invention, the end closure is characterised by that it has an in-and-out hole (3) in the body (1), which is tightly closed until opened for the first time using the valve (5) that has a hole around which, substantially perpendicularly to the hole surface, there are at least two latches (7) that are rotatably mounted in the mounting hole (4) from the inside of the end closure and interact with a knob (6) that has an arm (13) terminated with a cylindrical element (9) that has at least one carrier (10) on its side surface and is rotatably mounted in the mounting hole (4) from the outside of the end closure. The valve (5) and the knob (6) are sealed and immobilised with the help of the plastic foil (11).