upon a heat exchanger 14 for example within a vehicle base portion 163 may be equipped with a number of slots 167 169 171 to permit movement relative to respective pins 176 178 180 installed within each slot however seal 161 may be constructed with one round hole 173 to accommodate a round pin 174 in an interference type of fit for example with such an arrangement expansion and contraction of the material of seal 161 will be relative to pin 174 thus providing the advantage of a controlled expansion and contraction about pin 174 movement of pins fixed within a heat exchanger relative to a corresponding seal will now be explained fig9 depicts pin 174 and pin 176 which may be fixedly mounted within a top surface 34 fig4 of heat exchanger 20 when heat exchanger 20 experiences an increase in temperature that causes the material of heat exchanger 20 to expand pin 174 may move from location indicated by line 182 to a location indicated by line 184 while at the same time pin 176 may move from a location indicated by line 186 to a location indicated by line 188 similarly when heat exchanger 20 experiences a decrease in temperature that causes the material of heat exchanger 20 to contract pin 174 may move from location indicated by line 182 to a location indicated by line 190 while at the same time pin 176 may move from a location indicated by line 186 to a location indicated by line 192 thus because of movement of pins 174 180 in accordance with the representative example noted above horizontal portion 162 may be equipped with slots 166 172 more specifically slot 172 is sized to permit movement of pin 174 and slot 170 is sized to.