The arilock grommet is made of quality and thick silicone, PBA-free, sturdy and durable, not easy to get broken, ensure a long service life
This silicone grommet is widely applied in combination with an airlock to form a hermetic seal that protects food from oxygen and extends fermentation time
These fermentor grommets are applicable for airlocks, plastic covers and straws; It's very convenient for you to use these silicone grommets to convert glass bottles into airtight fermenters