Utica-Dunkirk 1401003 SPDT Pressure Switch Barb Fitting 0.5" WC

The Utica-Dunkirk 1401003 Switch with barb fitting is an air pressure sensing control component used to monitor differential or static pressure conditions within heating equipment. It operates as a single-pole double-throw switch that changes electrical state when the measured pressure reaches the specified threshold of 0.50 inches of water column in HVAC systems. The barb fitting provides a connection point for tubing that routes pressure signals from the combustion or airflow section of the system. It is commonly used in furnaces and boiler assemblies to verify proper draft, airflow, or venting conditions before or during operation.