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The Bard 800-0338 TXV Assembly is an OEM thermal expansion valve assembly used in Bard wall-mounted air conditioners and heat pumps to meter refrigerant into the evaporator and maintain proper superheat across changing load conditions. A correctly operating TXV helps prevent coil flooding or starvation, supports steady cooling performance, and can reduce nuisance issues tied to improper refrigerant feed. This Bard 800-0338 assembly is the right choice when you need a direct-fit replacement that matches Bard system requirements, but confirm application by model and serial number before ordering since TXVs are capacity and refrigerant specific.