FIG. 1 is an isometric view a spray actuator which is adapted for installation on a container (not shown); FIG. 2 is a front view thereof; FIG. 3 is a right side view thereof, the left side view thereof being a mirror image; FIG. 4 is a rear view thereof; and, FIG. 5 is a top view thereof. The undisclosed bottom view is unornamented and forms no part of the claimed design.