The ornamental design for a spray can attachment, as shown and described.
FIG. 1 is a perspective view of a spray can attachment in accordance with this invention.
FIG. 2 is a second perspective view of the spray can attachment of FIG. 1.
FIG. 3 is a left side view of the spray can attachment of FIG. 1.
FIG. 4 is a top view of the spray can attachment of FIG. 1.
FIG. 5 is a bottom view of the spray can attachment of FIG. 1.
FIG. 6 is a right side view of the spray can attachment of FIG. 1.
FIG. 7 is a front view of the spray can attachment of FIG. 1; and,
FIG. 8 is a rear view of the spray can attachment of FIG. 1.
The broken line representation of a spray can in FIG. 1 represents environmental structure forming no part of the claimed design.
The broken line representations of the inside of the spray can attachment in FIGS. 5 and 7 depict environmental subject matter only and form no part of the claimed design.