Air Lock (Twin Bubble S Type)

This one-piece S-shaped airlock features a smaller chamber so you can closely observe the CO2 rising and, with that, the rate of fermentation. Fill the airlock with water and insert it into a drilled stopper to vent gases during fermentation. Also handy when you are cooling a beer as there is less chance of getting water sucked back into the fermenter. The innovative S design prevents backflow.