The Alto-Shaam ALTTT3057 thermostat regulates temperature by responding to changes sensed through its bulb and capillary assembly. The 3/16" X 15-3/8" bulb and 42" capillary dimensions help identify the correct component during service and parts selection. Accurate thermostat operation supports consistent heating control in compatible commercial foodservice equipment. Before ordering, verify the listed dimensions and connection requirements against the equipment's parts documentation.