Aluminium alloy inlet or outlet air tank of heat exchangers for car cooling systems, manufactured to standard EN AC 42100 or EN AC 43000 T6 with - an insulating area flatness of not more than 0,1 mm, - a permissible particle quantity of 0,3 mg per tank, - a distance between pores of 2 mm or more, - pore sizes of not more than 0,4 mm, and - not more than 3 pores larger than 0,2mm-with a weight of 0,2kg or more but not more than 3kg

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