The AERCO 24356-1 Flame Detector Assembly with Gasket is a precision-engineered safety component designed for AERCO boilers and water heaters. It monitors the burner flame to ensure proper ignition and combustion, automatically signaling the control system if a flame failure occurs. https://www.partshnc.com/24356-1-aerco-boiler-and-water-heater-flame-detector-assmbly-wgskt