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Gems Warrick general purpose low water cutoff open circuit board control with retrofit standoff. Designed for boiler low-water cutoff protection. Reset is functional only if water has returned to normal level. Built-in 3 second time delay is standard. Applications include low-water cutoff, point level, valve control, single-level service, alarms, pump control. Meets CSD1 requirements. Non powered contacts. Compact size. LED monitoring. AC current minimizes electrolysis. 26K ohms direct sensitivity, 120 VAC voltage. Retrofit plate. U.L. 353, U.L. 508 file # MP1430 approvals. Measures 2-3/16" width by 2-1/2" height.