Airlock - Twin Bubble

Airlock - Twin Bubble

Hopback Homebrewing Supplies

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Airlock Twin S Bubble 

This S-bubble airlock is the selected choice for secondary fermenters, as it allows you to monitor the pressure in the fermenter.

Fill to line with boiled water or sanitizer to create a closed system, which allows CO2 to escape, but doesn't allow air back in to contaminate your wine or beer.