U.S. Seal PS-851 Seal Assembly In stock$1123
Quick overview
- Matched set The rotating half and the ceramic seat come together, so both faces are replaced as a pair.
- Two part numbers, one part Listed as PS-851 and also as PS851B.
- The part that stops a leaking pump A dripping motor end on a running pump is almost always the shaft seal.
- Replace it whenever the pump is open The seal faces bed in together and should not be reused once separated.
- Never run dry Seals fail fast when a pump loses prime, so fix the air leak before fitting a new one.
- Standard rebuild item The seal goes in alongside the gaskets and o-rings on any pump service.
Similar products
Other products people compare with this one.
Product details
The U.S. Seal PS-851 is a pump shaft seal assembly, also carried under the number PS851B. It is supplied as a complete assembly, the rotating half and the stationary ceramic seat together as a matched set.
What the shaft seal does
The shaft seal is the only thing keeping pool water out of the motor. Two lapped faces, one turning with the shaft and one fixed in the seal plate, run against each other under spring pressure. They wear as a pair, which is why a seal is always replaced as an assembly and why an old seat should never be reused with a new rotating half.
When to replace it
Water dripping from the joint between the wet end and the motor while the pump is running is the classic symptom. Left alone it runs straight into the motor bearings and turns a cheap part into a motor replacement, so a leak here is worth acting on quickly.
Make the new one last
Seals are destroyed by running dry. If the old seal failed early, look for a suction side air leak, a low water level or a blocked pump basket before you fit the new one, or the replacement will go the same way.
| Brand | U.S. Seal |
|---|---|
| Manufacturer part number | PS-851 |
| Also listed as | PS851B |
| Type | Shaft seal assembly |
| Part type | Pool pump part |
| Supplied as | Complete seal assembly |
| Shipping weight | 0.1 lb |
| Ships | Parcel |
Request a quote
Need a volume price, a freight quote, or pricing in writing before you order? We reply the same business day.
Customer reviews
Questions and answers
What people ask about this product, answered by our pool techs.