FIG. 1 is a perspective view of a valve for a tube showing our new design.

FIG. 2 is a side elevational view thereof, the opposite side elevational view being identical.

FIG. 3 is a top plan view thereof, the bottom plan view being identical.

FIG. 4 is a front end elevational view thereof; and,

FIG. 5 is a rear elevational view thereof.

The broken lines in the figures show boundaries of the invention and form no part of the claimed design.