Foam stoppers from William’s Brewing. Use as an airlock for yeast culturing, and even more useful as a sterile shield when preparing media. The proprietary foam is heat-resistant, and will withstand autoclaving or pressure cooking, making it an ideal flask plug when preparing sterile wort and agar. The honeycomb structure of the foam lets the plugged flask breathe, yet bacteria and wild yeast are filtered out and cannot reach the media. This means you can put your media in an Erlenmeyer flask, plug with a Foam Stopper, and pressure cook to sterilize, fully confident that bacteria and wild yeast will not enter the flask, even during the cooling and later storage period outside the pressure

Multiple sizes available #3 through #11

• For a limited time William’s Brewing is taking a whopping half off their entire lineup of foam stoppers.
• No coupon code required, discount reflected product pages.
• Shipping is free or reasonably priced flat rate to addresses in the contiguous US depending on your order size for most items.

Foam Stoppers at William’s Brewing

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