This is a brand new ClimaTek Furnace Air Pressure Switch. It is designed to work with Trane & American Standard furnaces. It is rated at -0.50 WC, has two wiring terminals and one hose port. It is designed to replace the part numbers listed below:
An air switch is safety designed to ensure that your inducer motor is running at the proper RPM, and creating the proper vacuum for your furnace to flue safely.