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The Bard 507-223-4 is an OEM adapter top assembly used on select Bard wall-mounted air conditioner cabinet adapter configurations to help maintain proper fit-up at the top section and support correct air path and weather protection where the adapter transitions to the unit. If your existing top adapter assembly is bent, leaking, or no longer sealing correctly, replacing it with the correct Bard part number helps restore the factory intended cabinet alignment and reduces the risk of water intrusion and nuisance rattles. Verify the exact part number from the unit data plate and the applicable Bard parts list for your model before ordering to ensure proper compatibility.