The ornamental design for a dividermanifold, as shown and described.
FIG. 1 is a perspective view of our new, original and ornamental design for a divider manifold;
FIG. 2 is a front view thereof;
FIG. 3 is a left side view thereof;
FIG. 4 is a right side view thereof;
FIG. 5 is a rear view thereof;
FIG. 6 is a top view thereof; and,
FIG. 7 is a bottom view thereof.
The broken line showing of the divider manifold is for illustrative purposes and forms no part of the claimed design. The undisclosed portion of the divider manifold forms no part of the claimed design.