The ornamental design for an adapter for strap type snowboard binding, as shown and described.
FIG. 1 is a perspective front and right side view of an adapter for strap type snowboard binding showing my new design, and shown in association with a snowboard binding depicted in phantom outline and not a part of this design;
FIG. 2 is a right side view thereof;
FIG. 3 is a left side view thereof;
FIG. 4 is a front view thereof;
FIG. 5 is a top view thereof showing the adapter in its closed state;
FIG. 6 is a top view thereof showing the adapter in its open state;
FIG. 7 is a rear view thereof;
FIG. 8 is a bottom view thereof; and,
FIG. 9 is a sectional view taken in the direction of the arrows upon the line 9—9 of FIG. 5.