Nourished Essentials claim they invented these types of lids that convert your wide mouth mason jar into a fermenter. Their statement of food safety and BPA free is under “product information”. It is an improved version of the ones I purchased and featured in my video, and has a screw top with a date dial. It comes with a pump for sucking out oxygen, which I love. Only 3 in a pack, but definitely enough to get you started.
