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Bard part 8406-123 is an OEM pressure transducer used to monitor refrigerant pressure and send a proportional signal to the unit controls for system protection and accurate operation. This transducer is commonly applied in Bard wall mounted packaged equipment where pressure feedback is used for safeties and diagnostics, and it is referenced as the pressure transducer used with Bard item 8612-028 per the manufacturer note. Use this Bard OEM sensor when replacing a failed or out of range pressure input to restore proper pressure monitoring, fault reporting, and dependable compressor operation, and confirm exact compatibility by matching the unit model and wiring harness connections before ordering.