We claim the ornamental design for a pipe-shaped vaporizer, as shown and described.
FIG. 1 is a top left isometric view of a pipe-shaped vaporizer showing our new design;
FIG. 2 is a bottom right isometric view thereof;
FIG. 3 is a front view thereof;
FIG. 4 is a rear view thereof;
FIG. 5 is a left side view thereof;
FIG. 6 is a right side view thereof;
FIG. 7 is a top view thereof; and,
FIG. 8 is a bottom view thereof.
The broken lines shown in the drawings depict portions of the pipe-shaped vaporizer that form no part of the claimed design. Additionally, portions of the pipe-shaped vaporizor that are not shown also form no part of the claimed design.