Fill the Bubbler Airlock with water and insert in drilled stopper or bung to vent gases during fermentation.
"Bubbler" style airlock makes a gratifying "bloop" noise during active fermentation. It is the preferred airlock for secondary fermentation, as it is possible to monitor the pressure inside the fermenter.
To use: Insert assembled airlock into the hole of the rubber stopper that fits your current jug or carboy. The airlock cap should always stay on top when in use; it has several small holes in it that allow gas to escape but prevent the water inside from quickly spilling out if tipped or jostled.
This is a classic design that has been used for years. Although there are newer designs on the market, this one is cost effective and it works. You don't need a fancy airlock for your fermentation tank, simple and effective is all you need.
The initial 1 gallon fermenter had several cracks in the bottom of the fermenter. Emailed Customer Service and after 3 days got a response back which Northern Brewer immediately took care of the problem by replacing the fermenter. The new fermenter came in excellent condition and I immediately put it into use.
Easier, economical, and fermentation/gas bubbles more visible than the three piece kind.
Works great always - easy
I have two of these and they are super great for wine and beer making. The siphon is the best thing about these making transfers a breeze. Easy to keep clean with the wide mouth and the plastic resists things that stick to other glass vessels such as hops, grains and yeast. The price makes owning a few worth it.