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Bard part number 5811-031 is an OEM capillary tube used in Bard wall-mount air conditioners and heat pumps as a fixed metering device to help regulate refrigerant flow through the system for stable operation. This tube is specified as 0.059 in ID by 0.112 in OD with a 36 inch length, making correct matching important for proper system performance and to avoid improper superheat and capacity issues. If you are replacing a restricted, kinked, or damaged cap tube during a sealed-system repair, confirm the original part number from your Bard unit data tag or service literature, then use 5811-031 to maintain factory-intended refrigerant metering and fit.