Between the melting and working end is a special area which is called Neck. A cooler in this area will assure the optimum glass temperature.
Due to thorough cooling of the liquid glass it becomes more homogenous which results in a good glass quality. Coolers are installed on both sides of the neck.
Coolers consist of heat resistant steel and water-cooled pipes. Steel pipes are fixed to the movable carriage. The height of the cooler can be adjusted by the jack. Installation into the neck / removal from the neck is done manually.