FIG. 1 is a perspective view of an air-tight valve for overtube according to my new design;
FIG. 2 is a front view thereof;
FIG. 3 is a back view thereof;
FIG. 4 is a top plan view thereof, the bottom view is a mirror image;
FIG. 5 is a left side view thereof, the right side is a mirror image;
FIG. 6 is a cross-sectional view thereof, taken along the line A—A in FIG. 2;
FIG. 7 is a cross-sectional view thereof, taken along the lines B—B in FIG. 2; and,
FIG. 8 is another perspective view thereof, shown in a state of use.
The broken line showing of the overtube in the FIG. 8 view is directed to environment and is for illustrative purposes only; the broken lines form no part of the claimed design.