This Grommet is designed to seal your Airlock into your Fermenter. 1 cm diameter designed to fit neatly with the following Plastic Fermenters with pre-drilled lids:

• 30 Litre Plastic Fermenter
• 60 Litre Plastic Fermenter

Note: Airlocks and Fermenters are sold separately and do not come with Grommets as a standard fitting.