Walk-in cooler Handles. Walk-in cooler door handles by Kason® The 1229C, 1236C, 1238C and the 027C Safety locking Door handles. Safety handles have an inside release to keep from getting trapped inside a cooler box or room even when the handle is locked. Providing replacement handle hardware for Walk in Coolers, Freezers and Warehouse storage boxes. All in stock ready for same day shipping.