Vaillant aquaPLUS/THERMOcompact/TURBOmax Air Pressure Switch 0020018138 050577Vaillant Air Pressure Switch (APS)Genuine replacement air pressure switch suitable for selected Vaillant AquaPLUS, ThermoCompact and TurboMAX boilers. Designed to safely monitor airflow and ensure correct boiler operation. Product Features: Genuine Vaillant spare part Part Numbers: 0020018138 050577 Air pressure switch (APS) OEM quality replacement component Monitors fan airflow and flue performance Ensures safe ignition sequence Reliable and durable

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This Part Fits the following appliances