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Bard part number 5651-099 is an OEM thermostatic expansion valve used in Bard wall-mounted air conditioners and related refrigeration circuits to meter refrigerant into the evaporator for stable superheat and consistent cooling performance. This valve helps prevent coil floodback or starved conditions by responding to load changes, making it a common fix when a unit shows symptoms like poor cooling, erratic suction pressure, or a frosted evaporator. Manufacturer sizing information indicates 1/2 x 7/8 x 1/4 ODF connections, so confirm line sizes and the exact Bard model and serial number before ordering to ensure proper fit and restore factory operation.