Fermentation cap 55 mm outer diameter with 10 mm hole (for 10 & 25 L balloon). This red fermentation cap made of hygienic, food-safe rubber is perfect for inserting the fermentation attachment 'Hobby', 'Duplex0' or 'ECO' from our range. This size fits the 10 and 25 litre glass balloons we offer. Put the fermentation cap over a large bottle or glass balloon and insert the fermentation attachment into the hole of the cap. You can be sure that no oxygen or bacteria, wild yeasts or impurities will get into your mash.
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