These extra caps are nothing more than dust covers. They fit loosely. Does NOT seal. Caps that come on the Demijohn fit tight. These extra lids do NOT. I wanted to have an extra lid to drill and use with an airlock for fermentation. This is only a dust cover.
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May 29, 2020
This fits perfectly onto the wide mouth demijohn. It’s a bit flimsy and will likely crack over time but who knows. For now, it works.