The ROYAL RANGE 4421 Oven Thermostat provides accurate temperature regulation to help maintain consistent cooking performance in compatible commercial ovens. Featuring a top adjustment with gas inlet down, a by-pass adjustment, a 3/16" x 11-3/16" sensing bulb, a 48" capillary, and a maximum temperature rating of 500°F, it responds to changes in oven temperature by controlling the flow... https://partsfe.ca/4421-royal-range-thermostat-bjwa-316-x-11-316-48