Copromec projected a special cooling bush. The cooling bush is very easy to fit: it has to be assembled on the front part of the shot sleeve and fixed with a locking screw. Then it is necessary to connect the water inlet and outlet circuits. Usually the cooling bush can be fitted also after assembling the plunger-rod unit. Thanks to its ease of disassembly, the cooling bush can be used on several shot sleeves with the same diameter.