Comfort-Aire Heat Controller Rheem Ruud Weatherking Century Furnace PRESSURE SWITCH 42-101233-81 Same as Century, Rheem, Protech, Fedders, Weatherking, Aitons' of Canada and RUUD Furnace part number 42-101233-81 We are a re-seller for Comfort-Aire Heating and Cooling Equipment. Call us today for all of your B Comfort-Aire Heating and Cooling Equipment parts and accessories needs.