$8.82
This Viton O-Ring (Part #23970504) is a critical sealing component for your Pfeiffer vacuum pump . It measures 55 mm (inner diameter) x 5 mm (cross section). 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 compatible with Pfeiffer, Busch, and Leybold pump brands . It fits the Pfeiffer DUO 250A and UNO 250A pump models, as well as Busch models WA501, WAU501, WS501, and WSU501 . 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 for the DUO 250A (PSK027) .
O-ring, 55 x 5 mm - Viton, Part# 23970504
O-ring, 55 x 5 mm - Viton, Part# 23970504
This is a Viton O-ring. Its part number is 23970504. 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 measures 55 mm on the inside and has a thickness of 5 mm .
This O-ring is made for several pump models across different brands :
Pfeiffer Pumps:
DUO 250A
UNO 250A
Busch Pumps:
WA501
WAU501
WS501
WSU501
If you own any of these pumps, this is the right O-ring for you. It is also included as a standard component in the Seal Kit for the DUO 250A (Part # PSK027), which contains two of these O-rings
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