Airlock Grommet
This airlock grommet makes any jar or bucket lid into a one-way fermentation vessel airlock. Use a 7/16" drill bit to drill a hole and pop the airlock grommet into place. Insert a 3-piece airlock or an s-shaped airlock into the grommet and fill it with water to begin the fermentation process that allows gasses to escape and keeps oxygen out. The airlock grommet is made with high quality rubber.