The design consists of the visual features of shape and configuration of the Adapter shown in solid lines in the hereto annexed drawings. The shade lines in the Figures show contour and not surface ornamentation.DESCRIPTION OF THE FIGURESFigure 1 is a front perspective view of the Adapter;Figure 2 is a rear perspective view of the Adapter of Figure 1;Figure 3 is a top view of the Adapter of Figure 1, the bottom view being a mirror image thereof;Figure 4 is a left side view of the Adapter of Figure 1;Figure 5 is a right side view of the Adapter of Figure 1;Figure 6 is a rear view of the Adapter of Figure 1;Figure 7 is a front view of the Adapter of Figure 1;Figure 8 is a front perspective view of a variant of the Adapter of Figure 1;Figure 9 is a rear perspective view of the Adapter of Figure 8;Figure 10 is a top view of the Adapter of Figure 8, the bottom view being a mirror image thereof;Figure 11 is a left side view of the Adapter of Figure 8;Figure 12 is a right side view of the Adapter of Figure 8;Figure 13 is a rear view of the Adapter of Figure 8;Figure 14 is a front view of the Adapter of Figure 8;Figure 15 is a front perspective view of a variant of the Adapter of Figure 1;Figure 16 is a rear perspective view of the Adapter of Figure 15;Figure 17 is a top view of the Adapter of Figure 15, the bottom view being a mirror image thereof;Figure 18 is a left side view of the Adapter of Figure 15;Figure 19 is a right side view of the Adapter of Figure 15;Figure 20 is a rear view of the Adapter of Figure 15;Figure 21 is a front view of the Adapter of Figure 15;Figure 22 is a front perspective view of a variant of the Adapter of Figure 1;Figure 23 is a rear perspective view of the Adapter of Figure 22;Figure 24 is a top view of the Adapter of Figure 22, the bottom view being a mirror image thereof;Figure 25 is a left side view of the Adapter of Figure 22;Figure 26 is a right side view of the Adapter of Figure 22;Figure 27 is a rear view of the Adapter of Figure 22; andFigure 28 is a front view of the Adapter of Figure 22.Drawings of the design are included.