Here is a hard to find part, that commonly snaps off from CMP Filter Housings. It is important beacuse it keeps the Skimmer Weir attached and prevents it from floating away. This skimmer can be found on Great Lakes Spas and many other brands.
Note: Using a Screw Driver and small hammer, you can easily chip away in seconds, the old clip which is broken off. Then apply a few dabs of clear glue to the bottom of the new clip and place it in the recess spot that holds the clip. See photo above of a new clip which has been glued in as a replacement. They color is darker than the original.