located below the surface of recess 84 this positioning protects the elements from damage and excessive wear while allowing the element to provide heat to barrel 22 in the preferred embodiment two cooling elements are utilized in fig4 and 5 they are referred to as a first cooling element 52 and a second cooling element 54 the number of cooling elements is however not limited to two as this number is for illustrative purposes both elements 52 and 54 create a passage from the exterior of block 72 to the recess 84 of the block 72 in operation air and or liquid is inserted through element 52 into recess 84 the air and or liquid fill the cavity created by recess 84 the air and or liquid then exits through element 54 the process is a continuous one causing a cooling effect to be exerted upon barrel 22 cooling element 50 is cast within heater band 10 and provides a cooling effect along barrel 22 cooling element 50 can utilize air or liquid to reduce the temperature of barrel 22 thus reducing the temperature of the flowable plastic material flowing there through a manifold apparatus which can be cast within heater band 10 or positioned along the exterior of heater band 10 provide air or liquid to cooling element 50.