The ornamental design for a lid for spraygun, as shown and described.
FIG. 1 is a front perspective view of the lid for a spray gun;
FIG. 2 is a front view thereof;
FIG. 3 is a back view thereof;
FIG. 4 is a left view thereof;
FIG. 5 is a right view thereof;
FIG. 6 is a top view thereof;
FIG. 7 is a bottom view thereof; and,
FIG. 8 is a perspective view of the lid assembled along with other components of the spray gun.
The broken lines shown in the drawings depict portions of the lid for spray gun that form no part of the claimed design. The broken line showing of the spray gun cup in FIG. 8 forms no part of the claimed design.