enter a first one of the crossing channels 124 or a first portion of one of the crossing channels 124 and then flow in a second opposite direction through a second one of the linear channels 122 in some embodiments of the injection station 46 plugs 126 may be strategically placed throughout the linear channels 122 and or the crossing channels 124 thereby directing the flow of the heat transfer fluid as illustrated in fig8 furthermore the plugs 126 may also be placed at or into each end of the linear and crossing channels 122 124 to prevent heat transfer fluid from entering or exiting at any locations other than the inlets 114 116 and outlets 118 120 at least a portion of the heat transfer channels 84 defined within the die sets 74 76 connect the heat transfer channels 84 defined within the parison mold halves 80 82 in serial fluid flow communication with one another as illustrated in fig1 the parison mold halves 80 82 may each define at least two spaced apart heat transfer channels referred to herein as mold half channels 128 the mold half channels 128 may be formed in the body mold halves 102 104 and or the neck mold halves 106 108 as later described herein specifically the first and second.