Copromec has projected a special cooling bush. The cooling bush can be easily fitted. It has to be assembled to the front part of the shot sleeve and fixed with a locking screw. Then it is required to attach the water inlet and outlet circuits. Generally the cooling bush can be set up also after the assembly of the plunger-rod unit. Due to its simplicity of disassembly, the cooling bush can be used with different shot sleeves with the same diameter.