Interchange Part Number: 4326, 206RD53M, 20721587, 206RD53MF, 206RD52M, 4326U. OE/OEM Part Number: 20721587. Applicable Models: Mack Volvo VNL Trucks. For Mack Volvo VNL Trucks. Flushing is the best way to get old oil and any solid contaminants when replacing any of the parts of an automotive air conditioner system.
