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Silicone Stopper (Vented)
Silicone Stopper (Vented)
 
The vented silicone stopper does the job of both a stopper and an airlock and fits most carboys greater than 3 gallons. There are 4 vents with a pliable seal that will open to let CO2 escape as it builds, but close instantly once the pressure is released. This prevents contamination by airborne pathogens. You no longer have to worry about liquid from the airlock spilling into your fermenting beer.
Price: $3.49

Availability: Usually Ships in 24 Hours
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Features
 

Silicone Stopper (Vented)

Diameter is 1 1/2" at the top, 1 1/16" at the bottom.

Average Customer Review: 1 of 5 Total Reviews: 2 Write a review.

  1 of 1 people found the following review helpful:
 
Not airtight, useless July 17, 2016
Reviewer: Phil from Calgary  
Like Robert said, this airlock isn't airtight. I also tried taking a razor to the flashing to make the airlock seal better, but it still easily allows flow in both directions. Entirely useless, put your money towards something else.

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  5 of 5 people found the following review helpful:
 
These are not airtight November 23, 2015
Reviewer: Robert Reynolds from Victoria BC  
I bought 5 of these recently. I've used some similar silicone waterless airlocks on a barrel, I was hoping these would work well for Carboys. These are in no way shape or form airtight, there is a significant amount of "flashing" around the mold lines. There is a significant gap between the bung piece and the cap piece. Easily enough space for fruit flies to get in, and not at all able to prevent gas exchange.

Even after taking a razor blade to the flashing to trim it off, the cap still doesn't seal at all. These do not work, all 5 that I bought are useless.

There are other similar airlocks this size that do in fact work, these are not them. Save you money.

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