NOTE: These are made to be used with the Berkey filtration system, which is a gravity-fed type purifier, but I imagine it would work with any system to which it can securely connect (but I wouldn't recommend using it in a pressurized system, because going 'slow' is part of what makes it work so well).
Berkey PF-2 fluoride water filters; fluoride and arsenic reduction filter elements for use in conjunction with the Black Berkey and/or other Berkey water filters in the Berkey system (and surely any others with the same size inlet/outlet port threads).
The package contains 2 filters, new, unused, and a kind of squishy washer used to prime the elements against your faucet.
P.S. Yes, I know Berkey is no longer made under the Berkey name, but under a new name. Plus, there are others of similar design.
Price is $55 for both filters.
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Scammers... please don't bother.
Thanks for looking!