3 Pack Silicone Lid / Air Lock

To prevent carbonation of your milk or water kefir, try 1 of these handy, wide mouth ferment lids.  They are made of durable, food grade silicone, and can be used with a wide mouth jar lid.  Simple to use, just place on jar and screw neck band down.  Will allow gas to escape during ferment but not allow anything inside, due to the incorporated air-lock.  Works well in keeping dust and bugs out of the ferment.  A must have for the more advanced fermenter.