Foam Stopper (46-50mm)

• Ideal for Yeast Starters: These breathable foam stoppers can endure boiling or autoclaving temperatures, making them a must - have for yeast starter preparation. • Airborne Bacteria Filter: The honeycomb structure of these stoppers acts as a powerful filter, keeping airborne bacteria and wild yeast out of your flask. • Versatile Usage: Instead of a fermentation lock, you can leave these large (46 - 50 mm wide) foam stoppers on your 2000 ml borosilicate glass flasks. Some folks even use them to replace fermentation locks in carboys!

These foam stoppers are perfect for homebrewers and professionals preparing yeast starters. They can be used when you're making a yeast starter in a 2000 ml borosilicate glass flask. You can also use them as an alternative to fermentation locks in carboys. The stoppers are 46 - 50 mm wide and are made of breathable foam that can handle high temperatures.