$8.33
This Viton O-Ring (Part #23970129) is a versatile sealing component for many vacuum pumps. It measures 65 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 is used in many models including the Pfeiffer DUO 120A, DUO 125, DUO 250A, DUO 255M, and UNO 250A. 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 Kits for the DUO 120A (PSK024) and DUO 125 (PSK025)
O-Ring,Viton,65 X 5 MM Part# 23970129
O-Ring,Viton,65 X 5 MM Part# 23970129
This is a Viton O-ring. Its part number is 23970129. 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 65 mm on the inside and has a thickness of 5 mm .
This is a very versatile O-ring. It works with multiple brands and many pump models. Here are the compatible pumps :
Pfeiffer Pumps:
DUO 2.5, DUO 2.5C
DUO 5, DUO 5C
DUO 6, DUO 6M
DUO 10, DUO 10C
DUO 11, DUO 11M, DUO 11MC
DUO 20, DUO 20C
DUO 30M
DUO 120A
DUO 125
DUO 250A
DUO 255M (Index C)
UNO 6
UNO 30M
UNO 250A
Busch Pumps: WS1001, WSU1001, WS2001, WSU2001, WS151, WS251, WSU151, WSU251, WS501, WSU501, WA151, WA251, WA501, WAU151, WAU251, WAU150, WAU250, WAU500, WSU150, WSU250, and many more .
Leybold Pumps: SV1200, SV500, SV630, SV750, SV630F, 0165D, 0205D, 0255D, 0305D, 0400B, 0502B, 0630B, 0255 .
If you own any of these pumps, this is the right O-ring for you
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10 in stock
10 in stock
10 in stock
10 in stock
10 in stock
This Viton O-ring (Part# PL23970129) measures 65 mm inside diameter with a 5 mm cross-section. Made from Viton (FKM) , it offers excellent resistance to high heat, chemicals, oils, and fuels. It is commonly used in repair kits for Busch, Leybold, and Pfeiffer vacuum pumps and is ideal for creating tight, reliable seals in harsh environments .
10 in stock
This is the Pfeiffer Part# PSK027 Seal Kit for the DUO 250A vacuum pump. This comprehensive kit includes O-rings, shaft seals, gaskets, and valve seats. Designed specifically for the DUO 250A, this kit provides everything you need to restore the sealing integrity of your pump during routine maintenance.
10 in stock
This Rotex 55 spider coupling (Part # 0512000116) is a elastomeric insert designed for KTR Rotex Size 55 jaw couplings . Made from high-strength T-PUR material with 92 Shore A hardness, this orange spider sits between the coupling hubs to transmit torque, dampen vibrations, and compensate for minor shaft misalignments . It is ideal for use with vacuum pumps driven by electric motors where reliable, low-maintenance power transmission is required.
10 in stock
10 in stock
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