Check the listing for details. TRIDELTA FS6769-1554 Air Pressure Switch 18J3301. Condition: Used. Listed at 25.00 USD. Up for sale is the actual item style you see in the pictures. This part was removed from a working furnace so it my be dusty/dirty. I don't know whether it was properly diagnosed, verified, or installed by a properly trained HVAC technician but rest assured that it is a working part that was thoroughly gone through.