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The design of the single-stage capillary thermostat is based on the fact that when the temperature of the controlled object changes, the liquid in the temperature sensing part (as shown in Figure 5) will change in volume according to the principle of thermal expansion and contraction. When the temperature rises, the liquid expands and the connected diaphragm box also expands; conversely, when the temperature drops, the diaphragm box shrinks. This change controls the on-off action of the switch through the lever action, thereby achieving constant temperature control. The YAXUN Capillary Thermostat is a single stage switch that opens on temperature rise between 50°F to 90°F. It can replace the German EGO single-stage capillary thermostat.