10 in stock
This Case Gasket (Part #300215) is made from high-quality cork. It sits between the main body parts of your Pfeiffer vacuum pump. Its job is simple but very important: it creates a tight seal. This seal stops air from leaking out and keeps dirt from getting in. A good gasket means your pump holds strong vacuum pressure. This specific gasket fits the Pfeiffer UNO 250A and DUO 250A models. If you notice oil sweating or leaking from the middle of your pump, this gasket may need to be replaced.
This Dowty Seal (Part #38250019) is a replacement part made for Pfeiffer vacuum pumps. It measures exactly 12.7 mm inside, 18 mm outside, and is 1.5 mm thick. This seal works with both the DUO 250A and UNO 250A pump models. Its job is to create a tight, airtight seal that stops leaks and keeps your pump running at its best. If you are rebuilding your pump or fixing a small leak, this is the right part for the job.
10 in stock
This Viton O-Ring (Part #PL23970419) is a critical sealing component for your vacuum pump. It measures 125 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 and Leybold pump brands . It fits the Pfeiffer DUO 120A, DUO 125, DUO 250A, DUO 255M (Index C), UNO 250A and Leybold Ruvac WAU2000, WSU2000, WA2001, WAU2001, WS2001, WSU2001 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 for the DUO 120A (PSK024) and the Overhaul Kit for the DUO 125 (PMK025) .
10 in stock
10 in stock
10 in stock
10 in stock
10 in stock
10 in stock
10 in stock
10 in stock
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) .
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# PMK027 Major Overhaul Kit for the DUO 250A vacuum pump. This complete kit includes everything you need for a full pump rebuild: vanes, springs, seals, O-rings, valves, coupling, gaskets, sight glass, and more. Following Pfeiffer’s recommended 4-year maintenance schedule, this kit restores your pump to like-new condition.
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