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Bard part 5651-148 is an OEM expansion valve with 3/8 inch by 3/8 inch connections used to meter refrigerant into the evaporator coil in Bard wall mounted and packaged HVAC equipment. A properly functioning valve helps maintain stable superheat and consistent cooling by matching refrigerant flow to load, which can reduce coil icing and prevent liquid floodback to the compressor. This is the correct choice when you are troubleshooting poor capacity, erratic suction pressure, or a valve that is restricted or stuck. Always confirm unit model and refrigerant type compatibility before ordering, and replace the sensing bulb insulation and any disturbed seals per Bard service guidance for a clean, leak free installation.