on the top side an outwardly projecting tubular part 152 which forms a passage 153 for delivering a medium from the pouch and or feeding a medium to the pouch the tubular part 152 is provided with a screw thread 154 for a screw cap not shown which can be used to close off the spout 150 the outwardly projecting tubular part 152 is furthermore provided with a locking flange 155 for the screw cap and beneath this two circumferential flanges 156 which are used for handling means for the spout 150 and the pouch to engage on after the spout 150 has been sealed in the pouch on the underside the spout 150 is provided with two sealing walls 158 159 which project freely downwards adjoin one another at their diametrically opposite ends and have an oval contour both on the inner side and on the outer side the sealing walls 158 159 adjoin the remainder of the spout body 150 only at their upper edge therefore the sealing walls 158 159 between them delimit an oval space in particular the sealing walls 158 159 have a curvature over their entire length in such a manner that each sealing wall 158 159 is externally.