The Bosch HVAC 87072064450 Flue Gas Safety Device is a safety component designed for compatible Bosch gas-fired boilers and water heating equipment. It monitors flue gas conditions to help detect unsafe temperatures or abnormal exhaust conditions and can interrupt equipment operation when a hazardous condition occurs. This protective function helps reduce the risk of overheating and i... https://www.partshnc.com/bosch-hvac-87072064450-flue-gas-safety-device