FIG. 1 is a front perspective view of a power take off adapter showing my new design. FIG. 2 is a rear perspective view of the power take off adapter. FIG. 3 is a front view thereof. FIG. 4 is a back view thereof. FIG. 5 is a right view thereof. FIG. 6 is a left view thereof. FIG. 7 is a top view thereof; and, FIG. 8 is a bottom view thereof.