Rubber Base for Lower Berkey Stainless Canisters Rubber Base For Stainless Units:Imperial the Imperial Berkey® System can

the Imperial Berkey® System can produce up to 5

If the water in any of the cups is red or has a pinkish tinge

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

Prime Rite™ Primer - (will not work on large faucet aerators)

- More details of the NSF testing from nsf

Rubber Base for Lower Berkey Stainless Canisters Rubber Base For Stainless Units:Imperial the Imperial Berkey® System canRubber 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"