The Dungs AA...A2 air pressure switch is field adjustable, compact pressure switches for automatic burner controls. AA...A2 differential pressure switches are suitable for making/breaking a circuit when the medium pressure changes relative to the set point. Not suitable for natural gas, propane, butane, and other combustible gases. Can be used as a pressure, vacuum or differential pressure switch for air and non-aggressive gases.

PART NUMBER HAS BEEN CHANGED - OLD PART NUMBER #254-395A