FERRODAY airlock grommet is made of food grade silicone, safe and durable.
Easy installationon a bucket lid and provide good seal for fermenting.
Grommet fits for 15, 25,30 and 60 liters fermenter great.
Air tight seal for most fermenter Air lock, stable condition for fermenting.
Package: 20pcs; Lifetime Technical Support: Please feel free to tell if any problem, we would try our best to help.