The ornamental design for a flexible waterhose, as shown and described.
FIG. 1 is a perspective view of the flexible water hose;
FIG. 2 is an enlarged perspective view of a first end thereof;
FIG. 3 is an enlarged perspective view of a second end thereof;
FIG. 4 is a front elevational view thereof;
FIG. 5 is an elevational view of the first end thereof; and,
FIG. 6 is an elevational view of the second end thereof.
The flexible water hose is shown with a symbolic break in its length. The appearance of any portion of the flexible water hose between the break lines forms no part of the claim.