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Bard part 800-0451 is an OEM distributor assembly used in the refrigerant circuit to properly split and route metered refrigerant into the coil circuits for even feeding and stable system operation. In Bard wall mounted air conditioners and heat pump units, a correctly matched distributor helps support consistent superheat control, balanced coil performance, and reliable cooling, especially after a leak repair or coil replacement. Replace this component when the original is restricted, damaged, or contaminated, and confirm fit by matching the unit model and serial details to the correct Bard parts list before ordering.