a seal for use in an extrusion device for producing continuous profiles , in particular plastics pipes includes an elastic sealing disc , which is arranged in a plane approximately perpendicularly to the extrusion direction and has a through - passage opening letting through the continuous profile and having a sealing rim bearing against the continuous profile . connection members are arranged along the sealing rim , and clamping elements are provided for exerting a force on the connection members , with the force acting radially with respect to the extrusion axis . the clamping elements are arranged in a plane parallel to the sealing disc , have a passage opening for the continuous profile and include connecting members for connecting the connection members to the clamping elements .