The ornamental design for the main body for intradermal injection device, as shown and described.
FIG. 1 is a perspective view of front, bottom and right side of the main body for intradermal injection device showing my new design;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a left side view thereof;
FIG. 5 is a right side view thereof;
FIG. 6 is a top view thereof;
FIG. 7 is a bottom view thereof; and,
FIG. 8 is an explanatory view of usage thereof.
The broken lines shown are included for the purpose of illustrating the unclaimed portions of the main body for intradermal injection device and form no part of the claimed design.