Sherwood 12859 Seal & Seat Assembly
The Sherwood 12859 is a mechanical seal and seat assembly molded in buna (nitrile) rubber, used to rebuild the shaft seal on several Sherwood raw water pump models. A worn seal and seat is one of the most common causes of a raw water pump leaking or losing prime at the shaft, so this is typically replaced any time a pump is rebuilt.
This assembly fits the Sherwood G30-2B, G45-1, G7B, M71, G151, K75B, G21, and G9901/3 pump series.
Key Features
- Buna (nitrile) seal material
- Matched seal-and-seat pair for a proper running fit
- Direct fit across multiple Sherwood pump series
Applications
- Sherwood raw water pump rebuilds and shaft seal replacement
- Engine cooling pump maintenance on Sherwood-equipped marine engines
Specifications
- Material: buna (nitrile)
- Type: mechanical seal and seat assembly
- Fits: Sherwood G30-2B, G45-1, G7B, M71, G151, K75B, G21, G9901/3
Frequently Asked Questions
Q: What pumps does this seal/seat assembly fit?
Sherwood's G30-2B, G45-1, G7B, M71, G151, K75B, G21, and G9901/3 pump series.
Q: What material is the seal made from?
Buna (nitrile) rubber.
Q: Does this include both the seal and the seat?
Yes — it's a matched seal-and-seat assembly, not the seal alone.
Q: When should this be replaced?
Any time the pump is rebuilt, or if the pump is leaking or losing prime around the shaft.
Not sure this is the right part? Send us a picture of your Pump Plate to https://www.clrmarine.com/Contact-Us and the CLR Marine team will confirm the correct seal and seat assembly.
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