An evaporator being a type of heat exchanger, consisting of aluminium pipes with copper ends enclosed with aluminium radiators: -measuring 337 x 237 x 17 mm or more, but not more than 868 x 399 x 78 mm, -with a total weight of a set of 236 g or more, but not more than 1 750 g, -with a fixed sensor, -with or without noise absorber, -with 2, 5 or 7 control and power connection pins terminated with sensor temperature type of socket, with or without heater and fuse type of socket, for use in the manufacture of products of subheadings 8418 10, 8418 21, 8418 40