Flask obtained by stretching comprises a cylindrical body and a long neck for drinking, and an external thread and a bushing, whose external diameter is equal to a diameter of the thread

摘要

The flask obtained by stretching comprises a cylindrical body (1) and a long neck (2) for drinking, and an external thread (4) and a bushing (5), whose external diameter is equal to a diameter of the thread. The bushing comprises a median groove with a width of half of its height. The groove has a depth equal to wall thickness of the flask.