The Star Mfg 2T-Z4293 Thermostat is a BJWA-style device featuring a bypass adjustment on the top and a downward gas inlet bulb, providing accurate temperature control. It has a 3/16” diameter x 8” length bulb with a 524” cap and it works best in temperatures of 150°F – 450°F. https://partsfe.ca/thermostatbjwa-316-x-8-24-for-star-part-2t-z4293