Honeywell Aquastat Controller, Breaks on Rise, 120 to 240 VAC/0.25 to 12 VDC, 100 to 240 degree Fahrenheit, 5.1 to 48 A, Horizontal/Vertical Mount, 3/8 x 2-7/8 inch Copper Bulb, Micro Switch Snap-Acting Switch
Aquastat Controllers are immersion type devices for limiting or regulating the temperature of liquids inch boilers, storage tanks and other applications where temperature control is required. Honeywell's L4006 are used inch applications that utilize the existing wells.