Product Description
Major Repair Kit for Welch 1376 - 1376PP/MS - OEM Equivalent
Repair Kit for Welch - OEM Equivalent
OEM-equivalent replacement, not manufactured by Welch, supplied by Vacuum Pump Supply.
Compatible Pump Models
- 1376
When Should You Rebuild or Service the Pump?
- Reduced vacuum performance
- Slow pump-down times
- Oil leaks or worn sealing components
- Excessive exhaust smoke or oil mist
- Worn or damaged internal components
- Scheduled preventative maintenance interval reached
Complete Welch Vacuum Pump Solutions
Vacuum Pump Supply stocks OEM-equivalent Welch repair kits, filters, vanes, gaskets, seals, bearings, and service parts for pump maintenance and rebuild work.
Welch Parts & Resources
Recommended Service Products
Why Buy from Vacuum Pump Supply?
- Vacuum pump specialists since 2006
- Over 15,000 vacuum pump parts and kits available
- OEM-equivalent replacement parts for hard-to-find vacuum pump models
- Fast shipping on stocked products
- Technical support from vacuum pump specialists
- Trusted by manufacturers, laboratories, universities, service companies, and maintenance teams
Frequently Asked Questions
Is this an OEM Welch product?
No. This is an OEM-equivalent product supplied by Vacuum Pump Supply.
What is the part number?
The part number is 1376PP/MS.
Can Vacuum Pump Supply help identify the correct part?
Yes. If you are unsure whether this is the correct product for your pump, contact Vacuum Pump Supply with your pump model and any existing part numbers.
Kit Includes
Vanes
- Vane, 1st Stage Phenolic, Welch, Duoseal, 1373, 1376, Part# 411748 — Qty 2
- Vane, 2nd Stage - Phenolic, Welch, Duoseal, Part# 412035 — Qty 2
Gaskets
- Gasket- Welch Duoseal, Part# 412291 — Qty 1
- Shaft Seal Gasket, Fisher Scientific, Part# 410643 — Qty 1
- Case Gasket, Welch, Duoseal, Part# 410403 — Qty 2
- Gasket, Welch, Duoseal, Part# 410234 — Qty 1
O-Rings & Seals
- Valve Spring, Welch, Chemstar, Duoseal, 1376N, 1376, Part# 412158 — Qty 4
- Pressure Relief Valve, Welch, Chemstar, Duoseal, 1376N, 1376, Part# 412154S — Qty 1
- Pressure Relief Valve - Welch, Chemstar, Duoseal, Part# 412153S — Qty 1
- Steel Ball, Welch, Duoseal, Chemstar, 1373, 1374, Part# 4401200 — Qty 1
- Welch Mechanical Shaft Seal with Screws, 0.750", Part# 1401D — Qty 1
- Woodruff Key, Cut, Welch, Chemstar, Duoseal, Part# 410613 — Qty 2
- Shaft Seal, Metal Case, Welch, Duoseal, Chemstar, Part# 410578 — Qty 1
- Thrust Washer- Welch, Chemstar, Duoseal, Part# 410508 — Qty 1
- V-Belt, Welch, Chemstar, Duoseal, 1376N, 1376, Part# 410713 — Qty 1
- Tension Washer, Welch Duoseal 1373, 1374, 1376, 1397, 1398, 1399, 1400, 1402, 1405, Part# 411266 — Qty 2
- Rubber Washer, Welch, Duoseal, Part# 411267 — Qty 2
- Spring, Welch Duoseal, Part# 411304 — Qty 6
Springs & Clips
- Spring Holder, Welch, Part# 410696 — Qty 3
Drive & Mechanical
- Woodruff Key, Cut, Fisher Scientific, Welch, Part# 410624 — Qty 1
- Pressure Relief Valve, Welch, Part# 410992 — Qty 1
- Disk Washer, Welch, Part# 411766 — Qty 3
Complete Bill of Materials
| Part Number | Description | Qty |
|---|---|---|
| 412291 | Gasket- Welch Duoseal, Part# 412291 | 1 |
| 412158 | Valve Spring, Welch, Chemstar, Duoseal, 1376N, 1376, Part# 412158 | 4 |
| 412154S | Pressure Relief Valve, Welch, Chemstar, Duoseal, 1376N, 1376, Part# 412154S | 1 |
| 412153S | Pressure Relief Valve - Welch, Chemstar, Duoseal, Part# 412153S | 1 |
| 4401200 | Steel Ball, Welch, Duoseal, Chemstar, 1373, 1374, Part# 4401200 | 1 |
| 1401D | Welch Mechanical Shaft Seal with Screws, 0.750", Part# 1401D | 1 |
| 410643 | Shaft Seal Gasket, Fisher Scientific, Part# 410643 | 1 |
| 410696 | Spring Holder, Welch, Part# 410696 | 3 |
| 410624 | Woodruff Key, Cut, Fisher Scientific, Welch, Part# 410624 | 1 |
| 410613 | Woodruff Key, Cut, Welch, Chemstar, Duoseal, Part# 410613 | 2 |
| 410578 | Shaft Seal, Metal Case, Welch, Duoseal, Chemstar, Part# 410578 | 1 |
| 410508 | Thrust Washer- Welch, Chemstar, Duoseal, Part# 410508 | 1 |
| 410403 | Case Gasket, Welch, Duoseal, Part# 410403 | 2 |
| 410234 | Gasket, Welch, Duoseal, Part# 410234 | 1 |
| 410713 | V-Belt, Welch, Chemstar, Duoseal, 1376N, 1376, Part# 410713 | 1 |
| 410992 | Pressure Relief Valve, Welch, Part# 410992 | 1 |
| 411266 | Tension Washer, Welch Duoseal 1373, 1374, 1376, 1397, 1398, 1399, 1400, 1402, 1405, Part# 411266 | 2 |
| 411267 | Rubber Washer, Welch, Duoseal, Part# 411267 | 2 |
| 411304 | Spring, Welch Duoseal, Part# 411304 | 6 |
| 411748 | Vane, 1st Stage Phenolic, Welch, Duoseal, 1373, 1376, Part# 411748 | 2 |
| 411766 | Disk Washer, Welch, Part# 411766 | 3 |
| 412035 | Vane, 2nd Stage - Phenolic, Welch, Duoseal, Part# 412035 | 2 |
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