Foam Stopper (35-45mm)

• Boil - and Autoclave - Resistant: These breathable foam stoppers can handle boiling or autoclaving temperatures, perfect for yeast starter preparation! • Airborne Bacteria Filter: Their honeycomb structure acts as a filter for airborne bacteria and wild yeast, protecting your flask during cooling. • Versatile Replacement: You can use them instead of fermentation locks on flasks or carboys. The small foam stoppers, 35 - 45mm wide, fit 500 or 1000 ml borosilicate glass flasks or glass carboys.

These foam stoppers are great for homebrewers and lab enthusiasts. Use them when preparing a yeast starter or during the fermentation process. They can be boiled or autoclaved. The stoppers are 35 - 45mm wide and fit 500 or 1000 ml borosilicate glass flasks or glass carboys.