10 in stock
This Round Ends Key (Part #220005) is a small but essential hardware component for your Pfeiffer DUO 125 vacuum pump. Unlike standard keys with square ends, this one has rounded ends . The key fits into slots on a shaft and a rotating part. Its job is to connect them together. It transmits torque, or turning power, from one part to another. Without it, the rotating parts would slip. This key is designed specifically for the Pfeiffer DUO 125 pump model .
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 .
This is the Pfeiffer Part# PMK025 Major Overhaul Kit for the DUO 125 (Index B) vacuum pump . This complete kit includes everything you need for a full pump rebuild: GX 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
10 in stock
This is the Pfeiffer Part# PSK025 Seal Kit for the DUO 125 (Index B) and DUO 125M vacuum pumps . This comprehensive kit includes O-rings, gaskets, springs, a sight glass, a hydraulic piston, a coupling, and more . Designed specifically for the DUO 125 series, this kit provides everything you need to restore the sealing integrity of your pump during routine maintenance.
Keep your Pfeiffer vacuum pump running smoothly with this Oil Seal (Part #310149). Made specifically for the DUO 120A and DUO 125 models, this small but critical part stops oil from leaking out and dirt from getting in. If you are rebuilding your pump or fixing a small leak, this seal is exactly what you need to get the job done right.
This Valve Seat (Part #390028) is a specialized component for your Pfeiffer DUO vacuum pump . It works together with the valve spindle to create a tight seal. This seal controls the flow of gases through the pump. A worn or damaged valve seat can cause leaks and reduce vacuum performance. This valve seat is designed specifically for the Pfeiffer DUO 125 and DUO 255M (Index C) pump models . If you are rebuilding your pump or fixing a valve leak, this is the part you need.
10 in stock
This spring (Part #490070) is a replacement part made specifically for the Pfeiffer DUO 125 vacuum pump . Inside your pump, this small but important spring provides the right tension to keep other components working together smoothly . If you are rebuilding your DUO 125 pump or fixing a performance issue, this is the correct spring
This spring (Part #490073) is a replacement part made specifically for the Pfeiffer DUO 125 vacuum pump . Inside your pump, this small but important spring provides the right tension to keep other components working together smoothly . If you are rebuilding your DUO 125 pump or fixing a performance issue, this is the correct spring for the job.
This Vane Spring (Part #490069) is a replacement part made for Pfeiffer DUO 120A and DUO 125 vacuum pumps . Unlike a regular spring, a vane spring has one specific job: it pushes the vane outward against the cylinder wall. This creates the seal needed to generate vacuum pressure. If you are rebuilding your pump, you will need eight of these springs for a full overhaul
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