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 create a closed system, which allows CO2 to escape, but doesn't allow air back in to contaminate your wine or beer.
California Proposition 65
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Large bubblers with s air lock.
I purchased 2 lg glass decanter with s air lock. One worked perfectly as expected. One had an issue with the attachment of the spigot. I could not get spigot sent with glass vessel to work without leaking. I purchased one from my supplier and it worked perfectly. I think these are an excellent purchase.