and 83 in order to allow only a slight bend of the tubing extending from fittings 82 and 83 the part of middle liner 45 generally disposed beneath the fittings may be sloped inwardly at an angle as illustrated in fig4 and 6 as is well known expansion of a refrigerant under pressure brings about a rapid temperature drop of the refrigerant the chilled refrigerant is thence conveyed through an area to be cooled to absorb heat from the area turning now to fig6 the expansion valve employed in the present invention to effect a temperature drop of the refrigerant under high pressure and conveyed from refrigeration unit 2 of the automobile through line 15 will be described a length of capillary tubing 86 extends from a fitting 87 at one end of coupling 33 into line 15 nominally the capillary tubing extends about twelve inches into the line end 88 of the capillary tubing is disposed within a volumetric space 89 within fitting 87 whereby the refrigerant flowing through line 15 is forced through capillary 86 and ejected into space 89 the sudden expansion of the refrigerant flowing out of end 88 results in a rapid temperature drop of the refrigerant as.