What is the composition of the washers used with Black Berkey® water filters?

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The washers are made of food-grade neoprene rubber. Additionally, no components used in Berkey® systems contain any harmful substances. For example, there is no trace of BPA in Berkey® products.

Regarding the washers, keep in mind that they never come into contact with the filtered or purified water.

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What is the composition of the washers used with Black Berkey® water filters?