Chest Clip Types
This is a correctly threaded paper-clip style chest clip. Notice how the harness strap on the child's left shoulder is threaded through the clip from behind, not over the front.
This is a correctly threaded 2-piece chest clip. The harness is threaded through the clip from behind and the clip snaps together when it is closed. There are several different styles of 2-piece clips.
This picture shows five different chest clips threaded on one carseat harness. The bottom chest clip is the correct clip for the seat. You can see how many different varieties of clips there are on the market, but they all do the same job of keeping the harness on the child's shoulders. Of course, your seat should have only the chest clip that came with the seat on the harness.