This Avantco 17816558 defrost element is a vital part of the refrigeration system on your SS-UC-36F-HC and SS-UC-36R-HC undercounter freezers and refrigerators. A working defrost element powers your unit's defrost cycle, which prevents performance-killing frost buildup. If your defrost element is broken or needs replaced, be sure to do so promptly so that your freezer always operates at peak efficiency.