Product Description
Major Repair Kit for Pfeiffer DUO 125 (Index B) / DUO 125 - PMK025 - OEM-Equivalent
OEM-Equivalent Major Repair Kit for Pfeiffer DUO 125 (Index B) / DUO 125 - PMK025
Vacuum Pump Supply OEM-equivalent repair components for vacuum pump service, maintenance, and rebuild applications.
Vacuum Pump Supply's OEM-equivalent major repair kit for pfeiffer duo 125 (index b) / duo 125 - pmk025 is designed to restore performance, reduce downtime, and provide a cost-effective alternative to purchasing individual OEM replacement components.
Compatible Pump Models
- Pfeiffer DUO 125
What This Kit Includes
- Vanes where required by the kit
- Shaft seals
- Gaskets and O-rings
- Valve components
- Springs and wear components
- Components commonly replaced during a major overhaul
When Should You Rebuild or Service This Pump?
- Reduced vacuum performance
- Slow pump-down times
- Oil leaks around seals, covers, or gaskets
- Worn or damaged vanes
- Contaminated oil or heavy service use
- Scheduled preventative maintenance interval reached
Complete Bill of Materials
The following components are included in this OEM-equivalent repair kit.
| Part Number | Description | Qty |
|---|---|---|
| 580044 | Piston,Hydraulic,Viton | 1 |
| 330096 | Ball,Steel,8 mm diameter, Mirror Finish | 1 |
| 320522 | O-Ring,Viton, 88x5 mm | 1 |
| 320521 | O-Ring,Viton, 75.56x5.33 mm | 3 |
| 320529 | O-Ring,Viton,410 X 3 mm | 1 |
| 23714036 | O-Ring,Viton,150 X 3 MM | 1 |
| 320336 | O-Ring,Viton,94 x 2.5 | 1 |
| PL23970419 | O-Ring,Viton,125 X 5 MM | 1 |
| 220005 | Key,Round ends | 1 |
| 220004 | Key,Feather,5 x 5 x 10,RND ENDS | 1 |
| 380048 | Plate,Spring,Non Return Valve | 2 |
| 580052 | Valve,Compression,UNO/DUO 120-250 | 1 |
| 390028 | Seat,Valve | 2 |
| 380047 | Plate,Valve,Aluminum, with O-Ring | 1 |
| 700074 | Filter,Pleated,Rubber Housing,DUO125 | 1 |
| PL20011245 | Finger,Exhaust | 2 |
| 490070 | Spring,DUO 125 | 1 |
| 580054 | Valve,Stamp | 2 |
| 490071 | Spring,DUO 125 | 1 |
| 250030 | Sleeve,Steel,DUO 120,125 | 1 |
| 700073 | Filter,Star-shaped Screen | 1 |
| 490069 | Spring,Vane | 8 |
| 440050 | Spacer,DUO 120A | 1 |
| 560014 | Sieve,Cylinder,DUO 120A | 1 |
| 230093 | Vane,GX,2nd Stg,DUO 120A/125A | 2 |
| 520035 | Ring,Support,DUO 120A | 1 |
| 300167 | Gasket,Sight Glass | 2 |
| 23970139 | O-Ring,Viton,100 X 5 MM | 1 |
| 320538 | O-Ring,Viton,85X5mm | 1 |
| PL23970129 | O-Ring,Viton,65 X 5 MM | 2 |
| 48652700 | O-Ring,Viton,66X2mm | 1 |
| 320524 | O-Ring,Viton, 32 x 2.5 mm | 2 |
| 2124025 | O-Ring,Viton,28 X 5 MM | 1 |
| 4070420 | O-Ring,Viton,24 X 2.5MM | 4 |
| 4070333 | O-Ring,VIT.19X2.5MM,UNO/DUO1.5 | 1 |
| 320177 | O-Ring,Viton,18x2.0mm | 1 |
| 4070166 | O-Ring,Viton.10 X 2.5MM | 1 |
| PL23970149 | O-Ring,Viton,8 X 2 MM | 1 |
| 4070088 | O-Ring,Viton,6 x 2.2 mm | 1 |
| 310149 | Seal,Oil,DUO 120A | 2 |
| 512107041 | Coupling,Insert,Rotex 42 | 1 |
| 330094 | Bearing,Needle | 4 |
| 230092 | Vane,GX,1st Stg,DUO 120A/125A | 2 |
| 490074 | Spring,40 mm Long,DUO 125 | 2 |
| 390024 | Buffer,Valve,Safety | 1 |
| 490073 | Spring,DUO 125 | 2 |
| 500023 | Sight Glass,UNO/DUO 35/65 | 1 |
Related Products & Resources
Service Support
Why Buy from Vacuum Pump Supply?
- Vacuum pump specialists since 2006
- Over 15,000 vacuum pump parts and kits available
- OEM-equivalent options for hard-to-find vacuum pump parts
- Fast shipping on stocked products
- Technical support from vacuum pump specialists
- Trusted by manufacturers, laboratories, universities, service companies, and maintenance teams
Helpful Resources
- Vacuum Pump Oil Cross Reference Chart
- Vacuum Pump Schematics, Manuals & Repair Resources
- Rotary Vane Vacuum Pump Repair Kits & Parts
- Vacuum Pump Oil
Frequently Asked Questions
Is this an OEM product?
No. This is an OEM-equivalent product supplied by Vacuum Pump Supply.
What is the part number?
The part number is PMK025.
What pump is this used on?
This product is assigned to the compatible pump category shown above. Always verify your pump model and part number before ordering.
Do you sell new pumps for this product family?
No new pump links are included for this product family. This page is focused on OEM-equivalent parts, service products, and repair resources.
Can Vacuum Pump Supply help confirm the right kit?
Yes. Contact Vacuum Pump Supply with your pump model, serial plate information, and any existing part numbers if you need help confirming compatibility.
