Pipe extruder sockets and fittings of thermoplastic materials thereby using pipe part formed (3)

The cooled drag piston for maintaining the size of the first tube in the pipe extruder, a cooling station, another drawing device, a measuring and controlling system for controlling the speeds of the first tube and completed tube, and a station for dividing the shaped tube into sockets or fittings. An extrusion die of the coating extruder is provided with a mandrel being disposed in a guide bush with a vacuum connection, said guide bush being surrounded by a cooling jacket, and the guide bush is fastened in the mandrel by the thermal insulating rings.