Hydrolevel 170SV Auto Reset Low Water Cut-Off with Short Probe 120V is a safety control device designed to protect boilers from operating with insufficient water levels. It works by continuously monitoring the water level through its short probe and automatically shutting off the burner when low water is detected. Once the proper water level is restored, the control automatically rese... https://www.partshnc.com/170sv-hydrolevel-120vautoresetlwcowshortprobe