The Buderus air pressure switch is a safety device that checks that the fan is fully operational. It ensures that there would not be a build-up of toxic gases inside the building without a way to get them outside if the fan in the boiler stopped working.
Fits multiple appliances
Technical specification
Waist Sizeaa44cj24fxTypeWater Pressure SensorCompatible WithGB142 SensorsSupplier Part Number8718600019Brand NameBuderus