core connector 112 and the protuberance 132 of the first extension tube 134 in the embodiment shown the clamp 136 includes a pair of opposed radially inwardly extending lips 138 that engage the first flared portion 128 of the inlet heater core connector 112 and the protuberance 132 of the first extension tube 134 it is understood that clamps having other shapes and configurations can be used as desired without departing from the scope and spirit of the invention the second end 124 of the first section 120 is substantially circular in cross section the intermediate portion 126 of the first section 120 has an inner surface 140 having a transition in diameter 142 that is adapted to abut a distal end 143 of the first extension tube 134 the inner surface 140 is adapted to engage an o ring 144 that is optionally disposed in a channel 146 formed in the extension tube 134 while a single o ring 144 is shown in the drawings additional o rings not shown may be disposed in the channel 146 or in additional channels not shown as desired the intermediate portion 126 has an outer surface 148 including a radially outwardly extending annular bend 150 formed adjacent to the second end 124 in the embodiment illustrated the second section 121 of the inlet heater core connector 112 is formed separately from and secured to an inlet cover portion 151 of the heat exchanger tank 116 it is understood that the second.