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
10 in stock
10 in stock
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)
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.
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
For complete kit content details see bill of materials below
This is the Pfeiffer Part# PVK025 Vane Kit for DUO 250A and DUO 255M (Index C) vacuum pumps . This kit includes four vanes and four springs . It is also compatible with the DUO 120A pump . for optimal performance, this vane kit provides a reliable solution for routine maintenance (recommended every 4 years) and helps restore your pump’s original vacuum performance .
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