73W76 - Armstrong OEM Replacement Furnace Air Pressure Switch 0.50"

Update: 9 months later, it's no longer working! 4+ months of that, the heat wasn't in use (hot water heater and moving air via the furnace only)! Better than having to replace the entire furnance, but unsure if the part would die quicker with the heat on, throughout the cold months or not!First the hot water vanished. Then the heat struggled to work. Didn't have five grand laying around for a new gas furnace, and wasn't about to pay someone hundreds of dollars to evaluate and/or fix if I could try and figure it out myself! Sure enough, this got my furnace back to normal and water running hot!!!

This inexpensive part fixed my furnace after just a little bit of troubleshooting and online research. It worked great, and saved me a lot of money.