This Avantco 360GSKT12258 door gasket is a direct replacement for the one that comes standard on Avantco CSM-4-HC countertop display refrigerated merchandisers. Gaskets are vital to your equipment, ensuring a tight seal when the door is closed and maximum temperature retention. A torn or damaged gasket allows cold air to escape, making your unit's refrigeration system work harder to perform optimally. Be sure to inspect your gasket regularly and replace it if you see signs of tears or damage!