Waterless Airlock?

[Korken91]

Hello all!
I'm a 1-2gallon brewer and I'm looking for a waterless airlock and found the Safety Cork for 1 gallon Demijohn. Anyone used them? Or have an other idea?

The reason I'm brewing small is space and keeping my wife happy. What she can't see, hear or smell she's okey with.
I often only put aluminum foil on top of my brews. But I would like to be able to let my mead sit in secondary for moths, and I don't dare with only aluminum foil.

 

[Radboud]

I use Sterilock for cold crashing mostly as it doesn't suffer from suck-back and promises to keep nasties out. How well the odor filter works I don't know, never used it. One of the major drawbacks is that it doesn't give any indication of fermentation being active like a bubbling airlock would do.

 

[Korken91]

That look like a good option! I'm not very worried about the smell (even if I did mention it) because small batch=low smell.