O-ring, 12.5 x 2.5 mm – Viton, Part# 320520

$3.29

This Viton O-Ring (Part #320520) is a critical sealing component for your Pfeiffer DUO 120A vacuum pump . It measures 12.5 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. If you are rebuilding your DUO 120A 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 this pump .

  • O-Ring, 26.9 x 2.4 mm - Metal

    O-ring, 12.5 x 2.5 mm - Viton, Part# 320520

    $3.29

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      O-Ring, 26.9 x 2.4 mm - Metal

      O-ring, 12.5 x 2.5 mm - Viton, Part# 320520

      $3.29

      Ask a Question

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      This is an O-ring. Its part number is 320520. An O-ring is a simple loop of elastic material. Its shape is a perfect circle. When you look at a cross-section, it looks like the letter “O”. That is where the name comes from.

      You place this O-ring into a groove between two metal parts. When you tighten the parts together, the O-ring gets squished. It fills the tiny gap completely. This creates an airtight, leak-proof seal

      This O-ring is made specifically for one pump model:

      • Pfeiffer DUO 120A 

      If you own this pump and are doing any internal repair or rebuild, you will need this O-ring.

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