The Ranco A30-321-000 Temperature Control W/ Shaft Stem Dial Plate & Knob 66" Cap is a comprehensive thermal regulation assembly designed to maintain precise operating temperatures in commercial refrigeration and cooling equipment. It works via a 66-inch liquid-filled capillary tube that detects internal cabinet temperatures, expanding or contracting internal bellows to actuate electr... https://partsfe.ca/a30-321-000-ranco-control-temperature