A rotary shaft lip seal is a small part with a big job: keep the water on the wet side and the oil on the dry side while the shaft spins between them. When one wears through, the fix costs a few dollars today or a bearing set next month.
Elite Manufacturing Systems stocks shaft lip seals and shaft cassette seals for Cornell and Pioneer pumps, matched by part number. Every pump lip seal and cassette oil seal in the catalog is a compatible or improved aftermarket component, not OEM, which typically saves about 30% versus OEM pricing.
These seals serve pump repair shops and maintenance crews in agricultural irrigation, municipal water, oilfield, and manufacturing operations across the United States and Canada.
Lip Seal or Cassette Seal: Know What Your Pump Runs
Both seal the spinning shaft. The difference is what they bring with them.
- Shaft lip seal: a single flexible sealing lip that rides on the shaft or sleeve. Simple, inexpensive, and the standard fit at most shaft positions.
- Shaft cassette seal: a pre-assembled unit that packages the sealing lip with its own wear surface and dirt-excluding lips. Built for mud, grit, and washdown service where a bare lip seal wears fast.
Your pump's part number decides which one fits each position, so match the number rather than the style. A double lip shaft seal adds a second lip for extra dirt exclusion where the part number calls for it.
Match the Seal to Your Pump
Every shaft lip seal and cassette seal here carries the part number that matches your Cornell or Pioneer pump, so the number on your parts list or old seal takes you straight to the replacement.
| Pump Brand | Part Number Series | Seal Types in Stock |
|---|---|---|
| Cornell | A-prefix (example: A17073A-18-EM) | Shaft lip seals and shaft cassette seals |
| Pioneer | 30500-prefix (example: 30500178-EM) | Shaft lip seals and shaft cassette seals |
If the old seal is too worn to read, a pump lip seal replacement can still be matched from the pump's serial number. Mechanical seals for the seal chamber itself live on the mechanical seals page.
Part number series from the Elite Manufacturing Systems catalog as of July 2026.
Get Parts From Louisiana or West Texas
Order in-stock parts before 12pm Central and they ship the same day from Lake Charles, Louisiana, with UPS Red next-day air available on request. Need it in hand today? Pick up at the Lake Charles headquarters or at the Midland, Texas distribution center.
Shaft Seal Questions, Answered
The difference between a lip seal and a mechanical seal is how they seal the rotating shaft. A lip seal presses a flexible rubber lip against the shaft or sleeve, while a mechanical seal runs two precision-lapped faces against each other. Mechanical seals handle the pressurized seal chamber; lip seals handle lower-pressure positions like bearing frames. Cornell and Pioneer pumps use both, which is why Elite Manufacturing Systems stocks lip and cassette seals here and mechanical seals on their own page.
A cassette seal is a self-contained sealing unit that combines a shaft lip seal, its own running surface, and dirt-excluding lips in one pre-assembled cartridge. Because the sealing lip never runs on the bare shaft, cassette seals survive mud, grit, and washdown service that wears out standard lip seals quickly. In agricultural service you may hear them called mudblock cassette seals. Elite Manufacturing Systems stocks shaft cassette seals for both Cornell and Pioneer pumps, matched by part number.
To size a cassette seal, start with the part number on the old seal or your pump's parts list; it encodes the shaft diameter and bore the seal was built for. No readable number? Send the pump's serial number, or measure the shaft diameter and the housing bore and send both. Call (337) 564-6428 or text a photo and the Elite Manufacturing Systems team will confirm the size before you order; there is no separate cassette seal sizing guide to decode.
Shaft seal leakage on a lip or cassette seal usually means the sealing lip has hardened, worn a groove into the shaft or sleeve, or been cut by grit. Oil weeping from the bearing frame or water tracking along the shaft are the usual signs. Replace the seal at the weep stage, and if the shaft or sleeve shows a wear groove, replace the sleeve too or the new seal will follow the old one fast.
No, these are not OEM seals. Elite Manufacturing Systems supplies compatible or improved aftermarket lip and cassette seals designed to fit Cornell and Pioneer pumps, typically priced about 30% below OEM. Most items carry a manufacturer defect warranty, and issues are handled case by case.
To confirm a lip or cassette seal fits your pump, send Elite Manufacturing Systems the pump's serial number, model number, or the part number on the old seal before you order. Call (337) 564-6428, email Chad@elitemanufacturingsystems.com, or text a photo of the seal or nameplate. The team verifies the match and points you to the exact part in the catalog.