This Avantco 17818889 door stopper is a perfect replacement for the one that came with select UBB-72S-HC, UBB-72S-GT-S, and UBB-72S-GT series units. It is a vital part of your unit's door assembly, working to create a firm door seal and keep the cabinet set to the right temperature. A broken or malfunctioning stopper can prevent your unit from maintaining specifications and cause strain on other components, so be sure to replace it promptly.