US 12043380 A description referring more particularly to the disclosure in the drawings wherein are shown illustrative embodiments of the present invention fig1 discloses the upper portion of a heat exchanger 10 such as a downflow type of automotive radiator including an inlet tank 11 having depending sides 12 terminating in a peripheral flange 13 a header plate 14 receiving the upper ends 16 of a plurality of tubes 15 which together with the corrugated heat transfer fins 17 form the heat exchange core of the radiator the periphery 18 of the header plate is in the form of a channel having a u shape to receive a resilient gasket 19 therein the flange 13 resting on the gasket also vertical supporting members 21 having flanges 22 contacting and or secured to the header plate may partially enclose the tube core to sealingly retain the inlet tank 11 and header plate 14 together one or more retaining clips or clamps 23 generally encompass the flange 13 header plate periphery 18 and sealing gasket 19 to clamp these members together each clamp includes a base flange 24 with an upwardly curled inner edge 25 a side wall 26 and an upper flange 27 that is initially inclined upward in dotted lines of fig1 and after clamping is inclined downwardly to clampingly engage the flange 13 of the inlet tank 11 the base flange 24 with.