This Avantco 17818515 left hinge glass door is a direct replacement for the one that came with Avantco UBB-36G-HC black bar refrigerators. 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 door can prevent your unit from maintaining specifications and cause strain on other components, so be sure to replace it promptly.