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Bard part 5651-036 is a 3/8 inch refrigerant check valve used in Bard wall mounted and packaged HVAC equipment to allow flow in one direction while preventing reverse flow that can upset refrigerant control, oil return, or overall system stability. When a check valve sticks or leaks, it can contribute to poor capacity, abnormal pressures, or hard to diagnose performance issues, so replacing it with the correct Bard OEM valve helps restore proper refrigerant circuit operation and dependable system performance. Verify your unit model and the piping connection style before ordering, since this part is commonly referenced as a swaged connection check valve in parts listings and must match the existing line set configuration.