The Armstrong Furnace R101432-13 SPST Pressure Switch is an essential part in HVAC systems and its main function is to measure and regulate the pressure of air. Located at a pressure range of -0.60” WC, the single pole single throw switch turns the system on or off depending on the pressure to maintain safety. This system is often applied in heating systems, air conditioning systems w... https://www.partshnc.com/r101432-13-armstrong-furnace-60-wc-spst-pressure-switch