This Viton O-Ring (Part #320524) is a critical sealing component for your Pfeiffer DUO vacuum pump . It measures 32 mm x 2.5 mm. Made from Viton, a high-performance synthetic rubber, this O-ring creates a tight, reliable seal. It prevents leaks and keeps your vacuum pressure strong. This O-ring is designed for the Pfeiffer DUO 120A, DUO 125, and DUO 255M (Index C) pump models . If you are rebuilding your pump, this O-ring is a must-have part. In fact, it is included as a standard component in the Seal Kit (Part # PSK024) for the DUO 120A .
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