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Aquastat Controllers are immersion type devices for limiting or regulating the temperature of liquids in boilers storage tanks and other applications where temperature control is required. Features Totally enclosed Micro Switch snap-acting switches operate on temperature rise to set point. Visible control point scale and external adjustment screw permit easy setting. Horizontal or vertical insertion of the sensing element. Direct well immersion or surface mounting of the sensing element available. Remote bulb model may be used to sense air temperature in ducts and in outside air sensing applications. Direct or well immersion Tradeline models include heat-conductive compound. Select models have wells.