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
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
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.
Kit Includes
Vanes
- Spring, Vane, Pfeiffer, DUO, DUO120A, DUO 125, Part# 490069 — Qty 8
- Pfeiffer DUO 12M, 2nd Stage Vane - Part # 230103 — Qty 2
- Pfeiffer DUO 125M, 1st Stage Vane - Part # 230104 — Qty 2
Gaskets
- Sight Glass Gasket, Pfeiffer, UNO, DUO, Part# 300167 — Qty 2
O-Rings & Seals
- O-ring, 88 x 5 mm - Viton, Part# 320522 — Qty 1
- O-ring, 75.56 x 5.33 mm - Viton, Part# 320521 — Qty 3
- O-ring, 410 x 3 mm - Viton, Part# 320529 — Qty 1
- O-ring, 150 x 3 mm - Viton, Part# 29361336 — Qty 1
- O-ring, 94 x 2.5 - Viton, Part# 320336 — Qty 1
- O-ring, 125 x 5 mm - Viton, Part# PL23970419 — Qty 1
- Plate, Valve, Aluminium, with O-ring, Pfeiffer, DUO, Part# 380047 — Qty 1
- O-ring, 100 x 5 mm - Viton, Part# 23970139 — Qty 1
- O-ring, 85 X 5mm - Viton, Part# 320538 — Qty 1
- O-Ring,Viton,65 X 5 MM Part# PL23970129 — Qty 2
- O-ring, 66 x 2 mm - Viton, Part# 48652700 — Qty 1
- O-ring, 32 x 2.5 mm - Viton, Part# 320524 — Qty 2
- O-ring, 28 x 5 mm - Viton, Part# 02124025 — Qty 1
- O-ring, 24 x 2.5mm - Viton, Part# 4070420 — Qty 4
- O-ring, 19 x 2.5 mm - Viton, Part# 4070333 — Qty 1
- O-ring, 18 x 2.0 mm - Viton, Part# 320177 — Qty 1
- O-ring, 10 x 2.5mm - Viton, Part# 4070166 — Qty 1
- O-ring, 8 x 2 mm - Viton, Part# PL23970149 — Qty 1
- O-ring, 6 x 2.2 mm - Viton, Part# 4070088 — Qty 1
- Seal, Oil, DUO 120A, Pfeiffer, DUO, Part# 310149 — Qty 2
Filters & Bearings
- Filter, Pleated, Rubber Housing, DUO125, Pfeiffer, DUO, Part# 700074 — Qty 1
- Filter, Star shaped Screen, Pfeiffer, DUO, DUO120A, Part# 700073 — Qty 1
- Needle Bearing, Pfeiffer, DUO, Part# 330094 — Qty 4
Springs & Clips
- Plate, Spring, Non Return Valve, Pfeiffer, DUO, Part# 380048 — Qty 2
- Spring, DUO 125 - Pfeiffer, Part# 490070 — Qty 1
- Spring, DUO 125 - Pfeiffer DUO, Part# 490071 — Qty 1
- Spring, 40 mm Long, DUO 125, Pfeiffer, DUO, Part# 490074 — Qty 2
- Spring, DUO 125, Pfeiffer, DUO, Part# 490073 — Qty 2
Drive & Mechanical
- Piston, Hydraulic, Pfeiffer, DUO, DUO 125, DUO 255M (Index C), Part# 580044 — Qty 1
- Ball, Steel, 8 mm diameter, Mirror Finish, Pfeiffer, DUO, Part# 330096 — Qty 1
- Key, Round ends, Pfeiffer, DUO, Part# 220005 — Qty 1
- Key, Feather, 5x5x10, Pfeiffer, DUO, Part# 220004 — Qty 1
- Valve, Compression, Pfeiffer, DUO, DUO250A, DUO120A, DUO125, Part# 580052 — Qty 1
- Seat, Valve, Pfeiffer, DUO, Part# 390028 — Qty 2
- Exhaust Finger, Part# PL20011245 — Qty 2
- Valve, Stamp, Pfeiffer, DUO, DUO250A, DUO255M(IndexC), DUO120A, Part# 580054 — Qty 2
- Sleeve, Steel, DUO 120, 125-Pfeiffer, DUO, Part# 250030 — Qty 1
- Spacer, DUO 120A, Pfeiffer, DUO, Part# 440050 — Qty 1
- Sieve, Cylinder, Pfeiffer, DUO, DUO250A, DUO 255M (Index C), Part# 560014 — Qty 1
- Ring Support, DUO 120A-Pfeiffer DUO, Part# 520035 — Qty 1
- Coupling, Pfeiffer, Mink, DUO 120A, DUO 125, Part# 512107041 — Qty 1
- Buffer, Valve, Safety, Pfeiffer, DUO, Part# 390024 — Qty 1
- Pfeiffer UNO/DUO Sight Glass, Part# 500023 — Qty 1
Complete Bill of Materials
| Part Number | Description | Qty |
|---|---|---|
| 580044 | Piston, Hydraulic, Pfeiffer, DUO, DUO 125, DUO 255M (Index C), Part# 580044 | 1 |
| 330096 | Ball, Steel, 8 mm diameter, Mirror Finish, Pfeiffer, DUO, Part# 330096 | 1 |
| 320522 | O-ring, 88 x 5 mm - Viton, Part# 320522 | 1 |
| 320521 | O-ring, 75.56 x 5.33 mm - Viton, Part# 320521 | 3 |
| 320529 | O-ring, 410 x 3 mm - Viton, Part# 320529 | 1 |
| 23714036 | O-ring, 150 x 3 mm - Viton, Part# 29361336 | 1 |
| 320336 | O-ring, 94 x 2.5 - Viton, Part# 320336 | 1 |
| PL23970419 | O-ring, 125 x 5 mm - Viton, Part# PL23970419 | 1 |
| 220005 | Key, Round ends, Pfeiffer, DUO, Part# 220005 | 1 |
| 220004 | Key, Feather, 5x5x10, Pfeiffer, DUO, Part# 220004 | 1 |
| 380048 | Plate, Spring, Non Return Valve, Pfeiffer, DUO, Part# 380048 | 2 |
| 580052 | Valve, Compression, Pfeiffer, DUO, DUO250A, DUO120A, DUO125, Part# 580052 | 1 |
| 390028 | Seat, Valve, Pfeiffer, DUO, Part# 390028 | 2 |
| 380047 | Plate, Valve, Aluminium, with O-ring, Pfeiffer, DUO, Part# 380047 | 1 |
| 700074 | Filter, Pleated, Rubber Housing, DUO125, Pfeiffer, DUO, Part# 700074 | 1 |
| PL20011245 | Exhaust Finger, Part# PL20011245 | 2 |
| 490070 | Spring, DUO 125 - Pfeiffer, Part# 490070 | 1 |
| 580054 | Valve, Stamp, Pfeiffer, DUO, DUO250A, DUO255M(IndexC), DUO120A, Part# 580054 | 2 |
| 490071 | Spring, DUO 125 - Pfeiffer DUO, Part# 490071 | 1 |
| 250030 | Sleeve, Steel, DUO 120, 125-Pfeiffer, DUO, Part# 250030 | 1 |
| 700073 | Filter, Star shaped Screen, Pfeiffer, DUO, DUO120A, Part# 700073 | 1 |
| 490069 | Spring, Vane, Pfeiffer, DUO, DUO120A, DUO 125, Part# 490069 | 8 |
| 440050 | Spacer, DUO 120A, Pfeiffer, DUO, Part# 440050 | 1 |
| 560014 | Sieve, Cylinder, Pfeiffer, DUO, DUO250A, DUO 255M (Index C), Part# 560014 | 1 |
| 520035 | Ring Support, DUO 120A-Pfeiffer DUO, Part# 520035 | 1 |
| 300167 | Sight Glass Gasket, Pfeiffer, UNO, DUO, Part# 300167 | 2 |
| 23970139 | O-ring, 100 x 5 mm - Viton, Part# 23970139 | 1 |
| 320538 | O-ring, 85 X 5mm - Viton, Part# 320538 | 1 |
| PL23970129 | O-Ring,Viton,65 X 5 MM Part# PL23970129 | 2 |
| 48652700 | O-ring, 66 x 2 mm - Viton, Part# 48652700 | 1 |
| 320524 | O-ring, 32 x 2.5 mm - Viton, Part# 320524 | 2 |
| 02124025 | O-ring, 28 x 5 mm - Viton, Part# 02124025 | 1 |
| 4070420 | O-ring, 24 x 2.5mm - Viton, Part# 4070420 | 4 |
| 4070333 | O-ring, 19 x 2.5 mm - Viton, Part# 4070333 | 1 |
| 320177 | O-ring, 18 x 2.0 mm - Viton, Part# 320177 | 1 |
| 4070166 | O-ring, 10 x 2.5mm - Viton, Part# 4070166 | 1 |
| PL23970149 | O-ring, 8 x 2 mm - Viton, Part# PL23970149 | 1 |
| 4070088 | O-ring, 6 x 2.2 mm - Viton, Part# 4070088 | 1 |
| 310149 | Seal, Oil, DUO 120A, Pfeiffer, DUO, Part# 310149 | 2 |
| 512107041 | Coupling, Pfeiffer, Mink, DUO 120A, DUO 125, Part# 512107041 | 1 |
| 330094 | Needle Bearing, Pfeiffer, DUO, Part# 330094 | 4 |
| 490074 | Spring, 40 mm Long, DUO 125, Pfeiffer, DUO, Part# 490074 | 2 |
| 390024 | Buffer, Valve, Safety, Pfeiffer, DUO, Part# 390024 | 1 |
| 490073 | Spring, DUO 125, Pfeiffer, DUO, Part# 490073 | 2 |
| 230103 | Pfeiffer DUO 12M, 2nd Stage Vane - Part # 230103 | 2 |
| 230104 | Pfeiffer DUO 125M, 1st Stage Vane - Part # 230104 | 2 |
| 500023 | Pfeiffer UNO/DUO Sight Glass, Part# 500023 | 1 |
Product Videos
Custom Field
GoogleCategory Business & Industrial > Manufacturing
