the cutting element 3 as is depicted in fig2 is normally not visible in this way prior to assembly the cutting element with the partial ring wall 32 protruding into the cylindrical pipe section 20 is typically connected to the spout filling 2 via predetermined breaking point bridges 34 not only the arrangement of said predetermined breaking point bridges 34 but also the relatively large dimensioning thereof is unusual this has to do with the fact that the solution depicted here is a substantially sturdier design with respect to known variants and therefore the sturdier predetermined breaking point bridges 34 can be destroyed without difficulty with the aid of the recess 36 in fig2 and the oblique view from above in fig4 driving dogs 37 integrally formed on the inside of the cylindrical pipe section 3 can also be seen in fig5 the screw cap is depicted by itself in a diametrical section the screw cap 4 has a cover surface 40 and a jacket wall 41 an internal thread 43 is formed in the jacket wall 41 which thread is embodied as fine thread and matches the external thread 22 on the cylindrical pipe section 20 provision is made for a sealing bead 44 to be integrally formed below the cover surface 40 and on the jacket wall 41 two wing like partial walls 42 comprise rib like thickenings which form driving dogs 45 said driving dogs 45 interact with the driving dogs.