The ornamental design for a door for refrigerator, as shown and described.
FIG. 1 is a front perspective view of a door for refrigerator, showing our new design;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a side view thereof;
FIG. 5 is another side view thereof;
FIG. 6 is a top view thereof;
FIG. 7 is a bottom view thereof;
FIG. 8 is another perspective view thereof as shown in a refrigerator environment; and,
FIG. 9 is an enlarged view of the encircled portion 9 in FIG. 1.
The broken lines illustrating portions of the door for refrigerator form no part of the claimed design. The dot-dash broken lines encircling portions of the claimed design that are illustrated in enlargements form no part of the claimed design.