The Adcraft FW-1200WT thermostat regulates temperature in compatible commercial food warming equipment through a capillary-based sensing mechanism. Its sensing assembly responds to temperature changes and operates the connected electrical contacts to control the heating circuit. This model features a 1/4-inch by 4-inch configuration and a 24-inch capillary tube. https://partsfe.com/fw-1200wt-adcraft-thermostat-55-14-x-4-24/1-FW-1200WT.html