The door shelf retainer bar end cap connects to the retainer bar on your refrigerator’s door shelf, and attaches it to the refrigerator door. If your shelf retainer bar has become disconnected, a damaged end cap could be the cause. To remove the end cap, first unhook the release tab on both ends of the retainer bar. Slide out the bar and the end caps, and slide out the defective cap. Now, simply replace the end cap and snap the bar with end caps back in place on the refrigerator door. This part is made of white plastic and is sold individually.