This is a BRAND NEW Gas Furnace Air Pressure Switch. It is made for York/Luxaire/Coleman systems and the part # is 024-25975-000 (also S1-02425975000 & 9371VO-HS-0064). It also is a direct replacement for all the part #s listed below. It is rated at -0.33" W/C with two wiring terminals and one hose port. Thanks for looking and good luck!
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.