Airlock S-Bubble type

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This S-bubble airlock is the preferred choice for secondary fermenters, as it allows you to monitor the pressure in the fermenter. Fill to line with boiled water or sanitizer to cr eate a closed system, which allows CO2 to escape, but doesn't allow air back in to contaminate your wine or beer. California Proposition 65 ⚠ Proposition 65 Warning: This product can expose you to chemicals that are known to the State of California to cause cancer and birth defects or other reproductive harm. Show more