These self-burping ferment caps have a one way waterless valve to vent gas automatically while home fermenting vegetables. This simple one-piece airlock requires no water, burping or maintenance. They fit snugly onto wide mouth mason jars and are dishwasher-safe. Kit comes with 4 tops.
Check if this is available and reserve it online through the Minerva catalog.
CML Library of Things
https://curtislibrarylibraryofthings.myturn.com/library/
https://curtislibrarylibraryofthings.myturn.com/library/