We claim the ornamental design for a pipe support attachment, as shown and described.
FIG. 1 is a perspective view of the pipe support attachment shown in a position of use;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a right-hand view thereof;
FIG. 5 is a left-hand view thereof;
FIG. 6 is a top view thereof;
FIG. 7 is a bottom view thereof;
FIG. 8 is a left perspective view thereof;
FIG. 9 is a left bottom perspective view thereof; and,
FIG. 10 is a right bottom perspective view thereof.
The design consists of the features of shape, ornamentation, and configuration of the pipe support attachment shown in the drawings. The stippled line portions of the figures depict environment only that form no part of the claim.