$288.40
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.
Seal Kit, Pfeiffer DUO 250A
Seal Kit, Pfeiffer DUO 250A
The DUO 250A is a large, powerful two-stage rotary vane pump. It is built for tough industrial jobs. This pump holds about 23 liters of oil. That tells you how big it is. It is used in many demanding applications where a strong, reliable vacuum is needed.
This kit includes every rubber seal your pump needs. Here is the complete list of what you get:
| Part Number | Description | Quantity |
|---|---|---|
| 4070166 | O-ring, 10 x 2.5 mm – Viton | 1 |
| 4070259 | O-ring, 15 x 2.5 mm – Viton | 2 |
| 320177 | O-ring, 18 x 2.0 mm – Viton | 1 |
| 4070333 | O-ring, 19 x 2.5 mm – Viton | 1 |
| 4070420 | O-ring, 24 x 2.5 mm – Viton | 4 |
| 320524 | O-ring, 32 x 2.5 mm – Viton | 1 |
| 02124025 | O-ring, 28 x 5 mm – Viton | 1 |
| 4070621 | O-ring, 38 x 3.0 mm – Viton | 2 |
| 320535 | O-ring, 500 x 3 mm – Viton | 1 |
| 320534 | O-ring, 180 x 5 mm – Viton | 1 |
| 48656700 | O-ring, 140 x 5 mm – Viton | 1 |
| PL23970419 | O-ring, 125 x 5 mm – Viton | 3 |
| 320533 | O-ring, 47 x 2.5 mm – Viton | 1 |
| 02106062 | O-ring, 107.32 x 5.33 mm – Viton | 4 |
| PL23970129 | O-ring, 65 x 5 mm – Viton | 2 |
| PL23970149 | O-ring, 8 x 2 mm – Viton | 1 |
| 320538 | O-ring, 85 x 5 mm – Viton | 1 |
| 4070088 | O-ring, 6 x 2.2 mm – Viton | 2 |
| 300167 | Sight Glass Gasket | 2 |
| 300214 | Ring Gasket | 2 |
| 310152 | Single Lip Shaft Seal | 2 |
| 390028 | Valve Seat | 2 |
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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 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.
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.
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