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Bard part number 5201-014 is a 3/8 inch sweat connection sight glass used in the liquid line to provide a clear visual check of refrigerant condition during charging and service. On many Bard wall mount and packaged systems, a properly functioning sight glass helps technicians confirm steady liquid flow and quickly spot signs that warrant further diagnostics, such as flashing that may indicate a feed issue. This OEM Bard 5201-014 sight glass is intended for brazed (sweat) installation in compatible refrigeration piping, so verify tubing size and the correct location in the circuit before ordering to ensure proper fit and service access.