This is a BRAND NEW OEM Heil/Tempstar/Inner City Products (ICP)/Comfort Maker/Sears/Arcoaire Gas Furnace Air Pressure Switch. The Part # is 1005577 (also HQ1005577TR- Tridelta Model # is FS6441-719). Switch has 2 wiring terminals and 1 hose port. It works on many Heil/Tempstar/ICP/Comfort Maker gas furnaces. 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.
FS6441-719 1005577 HQ1005577TR