The priming button is included in each set of Black Berkey Purification Elements; in case of loss, the priming button may be purchased individually.

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 Purification Element to maximize flow. Also, performs the same priming function for the PF-2 elements