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Alright, here's the deal: this is a brand spankin' new Sherwood 12859 mechanical seal seat.
Fresh out of the box, never used, still in its original packaging.

It's made by Ergoseal, and it's specifically designed to fit a bunch of those sea water pumps you see on boats and industrial gear—think models like the G21, G9901, G7, G9903, K75, and P1012.

If you're doing a pump rebuild, this is the exact piece you need to get things sealing up tight again.

It's sold as each unit.

No more leaks, just solid performance.

4 out of 5