- Priming button used to prepare or prime the Black Berkey Purification for use in the Berkey system.
- This foam rubber ring fits between a Black Berkey Purification Element and a pressurized faucet to "prime" the element, eliminating tiny air pockets in the Black Berkey Purificattion Element to maximize flow.
- Also performs the same priming function for the PF-2 elements The priming button is included in each set of Black Berkey Purification Elements; in case of loss, the priming button may be purchased individually
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