These silicon disks with vents in the middle are known as “pickle pipes”, but I call them “fermentation nipples” because, along with sounding more scientific, it makes me giggle like a schoolgirl each time I say it. Or type it. Or even think about it, frankly.
They fit on any wide-mouth Mason jar, and the nipples (*snork*) allow gases created by fermentation to escape while not allow oxygen in, so you get that lovely anaerobic reaction. I have a HUGE crock for making sauerkraut, but these will do for smaller batches, leftovers from filling said huge crock, and experimenting with things like carrots, cucumbers, and other ferment-able veggies.
Singing “Like a Pickle” to the tune of “Like a Virgin” and dancing around your kitchen giggling hysterically is entirely optional, but I think it makes the results taste better.
…sorry, I can’t stop laughing. Enjoy your weekend, chickadees.