Apparatus to insert a spigot into a flexible tube comprises a support for holding and advancing a spigot, actuated by a motor, and a grip for holding a flexible tube, its opening and closing controlled by a motor. On operation of the apparatus, the support is advanced to urge the spigot into the flexible tube. To prevent catching or snagging of the tube on the spigot preventing insertion, after forward motion of the spigot, the jaws are opened, and the spigot is retreated a short distance, the jaws are closed and the spigot is advanced again. This cycle is then repeated until the spigot is fully within the tube. The jaws have a front section and a separate back section, mounted against a resistance, to hold the tube. The front section will be urged back against the resistance on insertion of the spigot, which will not reach the back section.