Rubber Base for Lower Berkey Stainless Canisters Rubber Base For Stainless Units:Imperial Made from CTC-60 coconut shell

Made from CTC-60 coconut shell carbon

note *most water does not come in contact with the Food Grade plastic

Performing the Red Food Dye test on Black Berkey Elements (Test is especially recommended for untreated water)

The blocking plugs you receive will either be screw together or rubber plugs

Rubber Base for Lower Berkey Stainless Canisters Rubber Base For Stainless Units:Imperial Made from CTC-60 coconut shellRubber base (casing) for Berkey or Berkefeld Stainless steel canisters. If you are not sure of what system you have, measure the bottom diameter of your lower canister. Measurements are; Travel 7" Big 8" Royal 9" Imperial 10" Crown 11"