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What are the Berkey® Blocking Plugs made of?

Berkey® Water Purifier
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Historically, official Berkey® blocking plugs have come in three different varieties. The materials vary, however, they have all been made of food safe materials.

Effective this year (2021), all Berkey stainless steel systems and the Berkey Light system will come with the off-white plugs below.

Here they are:

  1. (To be discontinued in 2021) Black Blocking Plugs come standard in all Berkey Light® systems and some stainless steel systems. The black plugs are made of FDA approved Buna rubber.
  2. Off-White Blocking Plugs now come with the Berkey Light® and stainless steel systems. The off-white plugs are made of food grade M18 pure gum rubber.
  3. (To be discontinued in 2021) White Screw-Type Blocking Plugs are used in some stainless steel systems. These come with a nut, a screw and two clear washers. The nut and screw are made of Polypropylene. The washers are made of food- grade silicone.

Please keep in mind that the water in the bottom chamber of your unit will not touch any of the Blocking Plugs. The water will be filtered/purified before it reaches the bottom chamber.