The Henny Penny 16219 fryer thermocouple senses temperature within compatible commercial fryer equipment and sends a signal to the connected control system. Its 18-inch length identifies the specified sensing component for the fryer assembly. Temperature feedback allows the equipment controls to respond as operating conditions change during cooking. https://partsfe.com/thermocouple-18-for-henny-penny-part-16219/1-16219.html