Bard 9043-142 - 0.43 in. WC Pressure Switch

The Bard 9043-142 pressure switch is an OEM safety and proving switch used to verify the required air pressure signal before the unit is allowed to continue operating, helping protect the system by confirming proper airflow or draft conditions. With a 0.43 in. wc setpoint (often referenced as 2078081), this switch is designed to open or close its electrical contacts at the specified pressure so the control circuit can shut down the cycle if the correct pressure is not present. It is commonly applied in Bard wall-mounted equipment that relies on a pressure-proving input for safe operation, and replacing a weak or out-of-calibration switch with the correct Bard part helps restore reliable starts and reduces nuisance lockouts caused by erratic pressure sensing. Always match the part number and pressure rating to your unit model and serial information before ordering.

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