Abstract: A disintegrable plug apparatus for use in connection with petroleum wells, especially during pressure testing of such petroleum wells. The plug apparatus has an outer housing surrounding at least one sealing device and a plurality of supporting bodies, where at least one of the supporting bodies is in engagement with a locking device for locking to a locking sleeve. After application of a predetermined pressure on the plug apparatus, the at least one supporting body and the at least one sealing device are permitted an axial movement such that the at least one sealing device is brought into contact with loading devices for disintegration of the at least one sealing device.