This Coupling Washer (Part# 420043) is a genuine OEM-quality replacement component made of CRS (Cold Rolled Steel), designed specifically for the Pfeiffer DUO 2.5 and DUO 2.5C dual-stage rotary vane vacuum pumps . It is a critical component of the coupling assembly, helping to ensure proper connection between the motor and the pump for efficient power transmission . This washer is included as a standard component in the Major Overhaul Kit for the DUO2.5C and in the Major Overhaul Kit for the DUO2.5
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