The ornamental design for an end-fitting of a concentric-tube heat exchanger, as shown and described.
FIG. 1 is a left side view of the end-fitting of a concentric-tube heat exchanger design.
FIG. 2 is a cross-section view of the end-fitting of a concentric-tube heat exchanger design, taken about the line 2-2 shown in FIG. 1.
FIG. 3 is a perspective view of the end-fitting of a concentric-tube heat exchanger design.
FIG. 4 is a front view of the end-fitting of a concentric-tube heat exchanger design.
FIG. 5 is a cross-section view of the end-fitting of a concentric-tube heat exchanger design, taken about the line 5-5 shown in FIG. 4; and,
FIG. 6 is a cross-section view of the end-fitting of a concentric-tube heat exchanger design, taken about the line 6-6 shown in FIG. 4.
The dashed lines in the drawing figures represent the environment and do not constitute part of the claimed design. The ribs and cooling fins of the end-fitting of a concentric-tube heat exchanger design are axisymmetric.