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Bard part 800-0319 is an OEM cooling capillary tube (cap tube) assembly used in select Bard wall mounted air conditioner circuits to meter refrigerant flow and maintain stable evaporator performance. When a system has weak cooling, flooding, or erratic superheat due to a restricted or damaged cap tube, replacing the assembly with the correct Bard 800-0319 helps restore proper refrigerant control and factory intended capacity. Match this part by full model and serial number, since cap tube sizing and routing are application specific within Bard WA series and related units.