The ornamental design for a knock-out device for releasing chemistry from a chemistrycontainer, as shown and described.
FIG. 1 is a perspective view of a knock-out device showing my new design;
FIG. 2 is a front view thereof;
FIG. 3 is a right-side view thereof, the left-side view being a mirror image thereof;
FIG. 4 is a back view thereof;
FIG. 5 is a top view thereof; and,
FIG. 6 is a bottom view thereof.
The broken line showing of the lower portions of a chemistry container and a well in FIGS. 1 and 2 represents environmental subject matters and forms no part of the claimed design.