The ornamental design for a connector for breastpump, as shown and described.
FIG. 1 is a left, front perspective view of a connector for breast pump of the present invention;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a right side elevational view thereof;
FIG. 5 is a left side elevational view thereof;
FIG. 6 is a top view thereof; and,
FIG. 7 is a bottom view thereof.
The broken lines in the drawings illustrate portions of the connector for breast pump that form no part of the claimed design. The diagonal shade lines in the drawings indicate transparency.