The Vollrath/Idea-Medalie 17109-1 Bi-Metal Thermostat B200 with a 2 1/8″ stem and pointer knob is a temperature control parts used in commercial cooking equipment to regulate heat over a wide range from 0 °F to 320 °F. It operates by sensing temperature through its bi-metal element and opening or closing the internal switch to signal the heating system to cycle on or off as needed. In... https://www.partsfe.co.uk/vollrath-idea-medalie-17109-1-bi-metal-b200-thermostat-w-2-1-8-stem