
$6.30
This Viton O-Ring (Part #320521) is a critical sealing component for your Pfeiffer DUO vacuum pump . It measures 75.56 mm x 5.33 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 and DUO 125 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 .

O-ring, 75.56 x 5.33 mm - Viton, Part# 320521

O-ring, 75.56 x 5.33 mm - Viton, Part# 320521
This is an O-ring. Its part number is 320521. 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 for two Pfeiffer DUO pump models :
Pfeiffer DUO 120A
Pfeiffer DUO 125
If you own either of these pumps and are doing any internal repair or rebuild, you will need this O-ring.
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