This is a BRAND NEW Rheem/Weather King/Corsaire/RUUD Gas Furnace Air Pressure Switch! The Rheem/WKing/Corsaire/RUUD Part # is 42-101233-81 (also replaces 42-101233-01 and several other #s) and It's rated at 0.35" W/C . It has two wiring harnesses 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.