The International Comfort Products 1192717 Dual Air Pressure Switch is a safety control designed for compatible gas furnaces and HVAC heating equipment. It monitors pressure conditions within the combustion and venting system and uses pressure changes to open or close electrical contacts, confirming proper airflow and draft before allowing operation. This switch helps protect the furn... https://www.partshnc.com/1192717-international-comfort-products-dual-air-pressure-switch