The ornamental design for a screw capped tube, as shown and described.
FIG. 1 is a front elevational view of a screw capped tube incorporating the design of our new invention, the right-side, left-side and rear elevational views thereof being identical;
FIG. 2 is a top plan view thereof;
FIG. 3 is a bottom plan view thereof; and,
FIG. 4 is a cross-sectional view thereof taken along line 4—4 of FIG. 3.