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The Bard 8406-153 low pressure transducer is an OEM refrigerant-side pressure sensing component used on select Bard wall mounted HVAC systems to monitor suction pressure and provide a stable signal back to the unit controls for proper operation and protection. Replacing a failed transducer helps restore accurate pressure feedback that can affect compressor control, safeties, and overall system performance. Because pressure transducers can vary by range and connector style across model families, confirm 8406-153 against your Bard unit model and serial number or the correct parts list before ordering to ensure proper fit and function.