This rubber grommet is ideal for fermentation lids with an airlock.
It fits a 1/2" (13mm) hole, leaving a 3/8" (9.5mm) inner hole into which the airlock can be inserted, allowing for gas evacuation.
- Material: rubber
- Outer size: fits a 1/2" (13mm) hole
- Inner size: 3/8" (9,5mm)
- Quantity: 1