Fermentation lids for Mason jars (OX10 Cholsey)

Here are 4 fermentation lids for Mason Jars (American Brand). They do NOT fit British Kilner jars. I didn't know that! The opening is the same size, but the thread is different. You add water to the top, which creates an airlock allowing CO2 to escape without germs getting in.
Diameter outer probably 3" , inner more like 2 3/4. Also on other sites.